diff --git a/src/NAnt.Console/App.config b/src/NAnt.Console/App.config
index a3dc8ec13..8387dde84 100644
--- a/src/NAnt.Console/App.config
+++ b/src/NAnt.Console/App.config
@@ -14,6 +14,9 @@
         <add key="nant.shadowfiles.cleanup" value="False" />
         <!-- To enable internal log4net logging, uncomment the next line -->
         <!-- <add key="log4net.Internal.Debug" value="true"/> -->
+        <!-- To change the timeout value for external program output, uncomment 
+             the next line and change the value to the desired timeout (in milliseconds) -->
+        <!-- <add key="nant.externalprogram.output.timeout" value="2000"/> -->
     </appSettings>
     <!-- nant config settings -->
     <nant>
@@ -37,8 +40,8 @@
                     version="1.0"
                     description="Microsoft .NET Framework 1.0"
                     sdkdirectory="${path::combine(sdkInstallRoot, 'bin')}"
-                    frameworkdirectory="${path::combine(installRoot, 'v1.0.3705')}"
-                    frameworkassemblydirectory="${path::combine(installRoot, 'v1.0.3705')}"
+                    frameworkdirectory="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.0.3705')}"
+                    frameworkassemblydirectory="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.0.3705')}"
                     clrversion="1.0.3705"
                     clrtype="Desktop"
                     vendor="Microsoft"
@@ -58,7 +61,7 @@
                             </strict>
                         </modes>
                     </runtime>
-                    <reference-assemblies basedir="${path::combine(installRoot, 'v1.0.3705')}">
+                    <reference-assemblies basedir="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.0.3705')}">
                         <include name="Accessibility.dll" />
                         <include name="cscompmgd.dll" />
                         <include name="mscorlib.dll" />
@@ -99,7 +102,7 @@
                     <tool-paths>
                         <directory name="${path::combine(sdkInstallRoot, 'bin')}"
                             if="${property::exists('sdkInstallRoot')}" />
-                        <directory name="${path::combine(installRoot, 'v1.0.3705')}" />
+                        <directory name="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.0.3705')}" />
                     </tool-paths>
                     <project>
                         <readregistry
@@ -139,8 +142,8 @@
                     version="1.1"
                     description="Microsoft .NET Framework 1.1"
                     sdkdirectory="${path::combine(sdkInstallRoot, 'bin')}"
-                    frameworkdirectory="${path::combine(installRoot, 'v1.1.4322')}"
-                    frameworkassemblydirectory="${path::combine(installRoot, 'v1.1.4322')}"
+                    frameworkdirectory="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.1.4322')}"
+                    frameworkassemblydirectory="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.1.4322')}"
                     clrversion="1.1.4322"
                     clrtype="Desktop"
                     vendor="Microsoft"
@@ -160,7 +163,7 @@
                             </strict>
                         </modes>
                     </runtime>
-                    <reference-assemblies basedir="${path::combine(installRoot, 'v1.1.4322')}">
+                    <reference-assemblies basedir="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.1.4322')}">
                         <include name="Accessibility.dll" />
                         <include name="cscompmgd.dll" />
                         <include name="mscorlib.dll" />
@@ -205,7 +208,7 @@
                     <tool-paths>
                         <directory name="${path::combine(sdkInstallRoot, 'bin')}"
                             if="${property::exists('sdkInstallRoot')}" />
-                        <directory name="${path::combine(installRoot, 'v1.1.4322')}" />
+                        <directory name="${path::combine(string::replace(installRoot, 'Framework64', 'Framework'), 'v1.1.4322')}" />
                     </tool-paths>
                     <project>
                         <readregistry 
@@ -238,7 +241,7 @@
                     family="net"
                     version="2.0"
                     description="Microsoft .NET Framework 2.0"
-                    sdkdirectory="${path::combine(sdkInstallRoot, 'bin')}"
+                    sdkdirectory="${sdkInstallRoot}"
                     frameworkdirectory="${path::combine(installRoot, 'v2.0.50727')}"
                     frameworkassemblydirectory="${path::combine(installRoot, 'v2.0.50727')}"
                     clrversion="2.0.50727"
@@ -310,8 +313,7 @@
                         <include name="extensions/common/2.0/**/*.dll" />
                     </task-assemblies>
                     <tool-paths>
-                        <directory name="${path::combine(sdkInstallRoot, 'bin')}"
-                            if="${property::exists('sdkInstallRoot')}" />
+                        <directory name="${sdkInstallRoot}" if="${property::exists('sdkInstallRoot')}" />
                         <directory name="${path::combine(installRoot, 'v2.0.50727')}" />
                     </tool-paths>
                     <project>
@@ -319,11 +321,16 @@
                             property="installRoot"
                             key="SOFTWARE\Microsoft\.NETFramework\InstallRoot"
                             hive="LocalMachine" />
-                        <readregistry
-                            property="sdkInstallRoot"
-                            key="SOFTWARE\Microsoft\.NETFramework\sdkInstallRootv2.0"
-                            hive="LocalMachine"
-                            failonerror="false" />
+                        <locatesdk property="sdkInstallRoot" maxnetfxver="3.5" failonerror="false" />
+                        <if test="${not property::exists(sdkInstallRoot)}">
+                            <readregistry
+                                property="sdkInstallRoot"
+                                key="SOFTWARE\Microsoft\.NETFramework\sdkInstallRootv2.0"
+                                hive="LocalMachine"
+                                failonerror="false" />
+                            <property name="sdkInstallRoot" value="${path::combine(sdkInstallRoot, 'bin')}" 
+                                if="${property::exists(sdkInstallRoot)}"/>
+                        </if>
                     </project>
                     <tasks>
                         <task name="csc">
@@ -886,6 +893,133 @@
                         </task>
                     </tasks>
                 </framework>
+                <framework
+                    name="net-4.5"
+                    family="net"
+                    version="4.5"
+                    description="Microsoft .NET Framework 4.5"
+                    sdkdirectory="${sdkInstallRoot}"
+                    frameworkdirectory="${path::combine(installRoot, 'v4.0.30319')}"
+                    frameworkassemblydirectory="${path::combine(installRoot, 'v4.0.30319')}"
+                    clrversion="4.0.30319"
+                    clrtype="Desktop"
+                    vendor="Microsoft"
+                    >
+                    <runtime>
+                        <probing-paths>
+                            <directory name="lib/common/2.0" />
+                            <directory name="lib/common/neutral" />
+                        </probing-paths>
+                        <modes>
+                            <strict>
+                                <environment>
+                                    <variable name="COMPLUS_VERSION" value="v4.0.30319" />
+                                </environment>
+                            </strict>
+                        </modes>
+                    </runtime>
+                    <reference-assemblies basedir="${path::combine(installRoot, 'v4.0.30319')}">
+                        <include name="Accessibility.dll" />
+                        <include name="Microsoft.Build.Conversion.v4.0.dll" />
+                        <include name="Microsoft.Build.dll" />
+                        <include name="Microsoft.Build.Engine.dll" />
+                        <include name="Microsoft.Build.Framework.dll" />
+                        <include name="Microsoft.Build.Tasks.v4.0.dll" />
+                        <include name="Microsoft.Build.Utilities.v4.0.dll" />
+                        <include name="Microsoft.CSharp.dll" />
+                        <include name="Microsoft.Data.Entity.Build.Tasks.dll" />
+                        <include name="Microsoft.JScript.dll" />
+                        <include name="Microsoft.Transactions.Bridge.dll" />
+                        <include name="Microsoft.Transactions.Bridge.Dtc.dll" />
+                        <include name="Microsoft.VisualBasic.Activities.Compiler.dll" />
+                        <include name="Microsoft.VisualBasic.Compatibility.Data.dll" />
+                        <include name="Microsoft.VisualBasic.Compatibility.dll" />
+                        <include name="Microsoft.VisualBasic.dll" />
+                        <include name="Microsoft.VisualC.dll" />
+                        <include name="Microsoft.VisualC.STLCLR.dll" />
+                        <include name="mscorlib.dll" />
+                        <include name="System*.dll" />
+                    </reference-assemblies>
+                    <!-- WPF Assemblies -->
+                    <reference-assemblies basedir="${path::combine(installRoot, 'v4.0.30319')}/WPF">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${environment::get-folder-path('ProgramFiles')}/Reference Assemblies/Microsoft/Framework/.NETFramework/v4.5">
+                        <include name="Microsoft*.dll" />
+                        <include name="mscorlib.dll" />
+                        <include name="PresentationBuildTasks.dll" />
+                        <include name="PresentationCore.dll" />
+                        <include name="WindowsBase.dll" />
+                        <include name="PresentationFramework*.dll" />
+                        <include name="ReachFramework.dll" />
+                        <include name="System*.dll" />
+                    </reference-assemblies>
+                    <task-assemblies>
+                        <!-- include MS.NET version-neutral assemblies -->
+                        <include name="extensions/net/neutral/**/*.dll" />
+                        <!-- include MS.NET 4.0 specific assemblies -->
+                        <include name="extensions/net/4.0/**/*.dll" />
+                        <!-- include MS.NET specific task assembly -->
+                        <include name="NAnt.MSNetTasks.dll" />
+                        <!-- include MS.NET specific test assembly -->
+                        <include name="NAnt.MSNet.Tests.dll" />
+                        <!-- include .NET 4.0 specific assemblies -->
+                        <include name="extensions/common/4.0/**/*.dll" />
+                    </task-assemblies>
+                    <tool-paths>
+                        <directory name="${sdkInstallRoot}"
+                            if="${property::exists('sdkInstallRoot')}" />
+                        <directory name="${path::combine(installRoot, 'v4.0.30319')}" />
+                    </tool-paths>
+                    <project>
+                        <readregistry
+                            property="installRoot"
+                            key="SOFTWARE\Microsoft\.NETFramework\InstallRoot"
+                            hive="LocalMachine" />
+                        <locatesdk property="sdkInstallRoot" minwinsdkver="v7.0A" minnetfxver="4.0" maxnetfxver="4.0.99999" failonerror="false" />
+                    </project>
+                    <tasks>
+                        <task name="csc">
+                            <attribute name="supportsnowarnlist">true</attribute>
+                            <attribute name="supportswarnaserrorlist">true</attribute>
+                            <attribute name="supportskeycontainer">true</attribute>
+                            <attribute name="supportskeyfile">true</attribute>
+                            <attribute name="supportsdelaysign">true</attribute>
+                            <attribute name="supportsplatform">true</attribute>
+                            <attribute name="supportslangversion">true</attribute>
+                        </task>
+                        <task name="vbc">
+                            <attribute name="supportsdocgeneration">true</attribute>
+                            <attribute name="supportsnostdlib">true</attribute>
+                            <attribute name="supportsnowarnlist">true</attribute>
+                            <attribute name="supportskeycontainer">true</attribute>
+                            <attribute name="supportskeyfile">true</attribute>
+                            <attribute name="supportsdelaysign">true</attribute>
+                            <attribute name="supportsplatform">true</attribute>
+                            <attribute name="supportswarnaserrorlist">true</attribute>
+                        </task>
+                        <task name="jsc">
+                            <attribute name="supportsplatform">true</attribute>
+                        </task>
+                        <task name="vjc">
+                            <attribute name="supportsnowarnlist">true</attribute>
+                            <attribute name="supportskeycontainer">true</attribute>
+                            <attribute name="supportskeyfile">true</attribute>
+                            <attribute name="supportsdelaysign">true</attribute>
+                        </task>
+                        <task name="resgen">
+                            <attribute name="supportsassemblyreferences">true</attribute>
+                            <attribute name="supportsexternalfilereferences">true</attribute>
+                        </task>
+                        <task name="delay-sign">
+                            <attribute name="exename">sn</attribute>
+                        </task>
+                        <task name="license">
+                            <attribute name="exename">lc</attribute>
+                            <attribute name="supportsassemblyreferences">true</attribute>
+                        </task>
+                    </tasks>
+                </framework>
                 <framework 
                     name="netcf-1.0"
                     family="netcf"
@@ -1724,6 +1858,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/1.0')}" />
                         <!-- for compatibility with Mono 1.0.x -->
                         <directory name="${frameworkAssemblyDirectory}" />
@@ -1782,6 +1917,14 @@
                         <if test="${version::parse(mono.version) >= version::parse('1.2.3.50')}">
                             <property name="resgen.supportsexternalfilereferences" value="true" />
                         </if>
+                        <if test="${version::parse(mono.version) &lt; version::parse('3.0')}">
+                            <property name="csc.tool" value="gmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${version::parse(mono.version) >= version::parse('3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="2"/>
+                        </if>
 
                         <target name="configure-from-pkg-config">
                             <property name="mono.version" value="${pkg-config::get-mod-version('mono')}" />
@@ -1820,7 +1963,8 @@
                             <attribute name="managed">true</attribute>
                         </task>
                         <task name="csc">
-                            <attribute name="exename">gmcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
                             <attribute name="supportsnowarnlist">true</attribute>
@@ -1912,6 +2056,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/3.5')}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/2.0')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/1.0')}" />
                         <!-- unmanaged tools -->
@@ -1934,6 +2079,14 @@
 
                         <property name="toolDirectory" value="${path::combine(frameworkAssemblyDirectory, 'mono/3.5')}" />
                         <property name="runtimeEngine" value="${path::combine(sdkInstallRoot, 'bin/mono.exe')}" />
+                        <if test="${version::parse(mono.version) &lt; version::parse('3.0')}">
+                            <property name="csc.tool" value="gmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${version::parse(mono.version) >= version::parse('3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="2"/>
+                        </if>
 
                         <target name="configure-from-pkg-config">
                             <property name="mono.version" value="${pkg-config::get-mod-version('mono')}" />
@@ -1972,7 +2125,8 @@
                             <attribute name="managed">true</attribute>
                         </task>
                         <task name="csc">
-                            <attribute name="exename">gmcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="langversion">linq</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
@@ -2067,6 +2221,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.0')}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/3.5')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/2.0')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/1.0')}" />
@@ -2090,6 +2245,14 @@
 
                         <property name="toolDirectory" value="${path::combine(frameworkAssemblyDirectory, 'mono/4.0')}" />
                         <property name="runtimeEngine" value="${path::combine(sdkInstallRoot, 'bin/mono.exe')}" />
+                        <if test="${version::parse(mono.version) &lt; version::parse('3.0')}">
+                            <property name="csc.tool" value="dmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${version::parse(mono.version) >= version::parse('3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="4"/>
+                        </if>
 
                         <target name="configure-from-pkg-config">
                             <property name="mono.version" value="${pkg-config::get-mod-version('mono')}" />
@@ -2128,7 +2291,8 @@
                             <attribute name="managed">true</attribute>
                         </task>
                         <task name="csc">
-                            <attribute name="exename">dmcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="langversion">linq</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
@@ -2212,6 +2376,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/2.0')}" />
                         <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/1.0')}" />
                         <!-- unmanaged tools -->
@@ -2234,6 +2399,14 @@
 
                         <property name="toolDirectory" value="${path::combine(frameworkAssemblyDirectory, 'mono/2.1')}" />
                         <property name="runtimeEngine" value="${path::combine(sdkInstallRoot, 'bin/mono.exe')}" />
+                        <if test="${version::parse(mono.version) &lt; version::parse('3.0')}">
+                            <property name="csc.tool" value="smcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${version::parse(mono.version) >= version::parse('3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="2.1"/>
+                        </if>
 
                         <target name="configure-from-pkg-config">
                             <property name="mono.version" value="${pkg-config::get-mod-version('mono')}" />
@@ -2267,7 +2440,8 @@
                     </project>
                     <tasks>
                         <task name="csc">
-                            <attribute name="exename">smcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
                             <attribute name="supportsnowarnlist">true</attribute>
@@ -2502,6 +2676,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/4.5')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/1.0')}" />
                         <!-- unmanaged tools -->
                         <directory name="${prefix}/bin" />
@@ -2526,13 +2701,22 @@
                         <if test="${pkg-config::is-atleast-version('mono', '1.2.3.50')}">
                             <property name="resgen.supportsexternalfilereferences" value="true" />
                         </if>
+                        <if test="${not(pkg-config::is-atleast-version('mono', '3.0'))}">
+                            <property name="csc.tool" value="gmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${pkg-config::is-atleast-version('mono', '3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="2"/>
+                        </if>
                     </project>
                     <tasks>
                         <task name="al">
                             <attribute name="managed">true</attribute>
                         </task>
                         <task name="csc">
-                            <attribute name="exename">gmcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
                             <attribute name="supportsnowarnlist">true</attribute>
@@ -2616,6 +2800,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/4.5')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/2.0')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/1.0')}" />
                         <!-- unmanaged tools -->
@@ -2628,13 +2813,22 @@
                         <property name="resgen.supportsexternalfilereferences" value="false" />
                         <property name="prefix" value="${pkg-config::get-variable('mono', 'prefix')}" />
                         <property name="toolDirectory" value="${path::combine(prefix, 'lib/mono/3.5')}" />
+                        <if test="${not(pkg-config::is-atleast-version('mono', '3.0'))}">
+                            <property name="csc.tool" value="gmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${pkg-config::is-atleast-version('mono', '3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="2"/>
+                        </if>
                     </project>
                     <tasks>
                         <task name="al">
                             <attribute name="managed">true</attribute>
                         </task>
                         <task name="csc">
-                            <attribute name="exename">gmcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="langversion">linq</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
@@ -2721,6 +2915,126 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/4.5')}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/3.5')}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/2.0')}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/1.0')}" />
+                        <!-- unmanaged tools -->
+                        <directory name="${prefix}/bin" />
+                    </tool-paths>
+                    <project>
+                        <if test="${not pkg-config::exists('mono')}">
+                            <fail>Unable to locate 'mono' module using pkg-config. Download the Mono development packages from http://www.mono-project.com/downloads/.</fail>
+                        </if>
+                        <property name="resgen.supportsexternalfilereferences" value="false" />
+                        <property name="prefix" value="${pkg-config::get-variable('mono', 'prefix')}" />
+                        <property name="toolDirectory" value="${path::combine(prefix, 'lib/mono/4.0')}" />
+                        <if test="${not(pkg-config::is-atleast-version('mono', '3.0'))}">
+                            <property name="csc.tool" value="dmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${pkg-config::is-atleast-version('mono', '3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="4"/>
+                        </if>
+                    </project>
+                    <tasks>
+                        <task name="al">
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="csc">
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
+                            <attribute name="managed">true</attribute>
+                            <attribute name="langversion">linq</attribute>
+                            <attribute name="supportspackagereferences">true</attribute>
+                            <attribute name="supportsnowarnlist">true</attribute>
+                            <attribute name="supportsdocgeneration">true</attribute>
+                            <attribute name="supportskeycontainer">true</attribute>
+                            <attribute name="supportskeyfile">true</attribute>
+                            <attribute name="supportsdelaysign">true</attribute>
+                            <attribute name="supportslangversion">true</attribute>
+                        </task>
+                        <task name="jsc">
+                            <attribute name="exename">mjs</attribute>
+                            <attribute name="managed">strict</attribute>
+                        </task>
+                        <task name="vbc">
+                            <attribute name="exename">vbnc</attribute>
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="resgen">
+                            <attribute name="managed">true</attribute>
+                            <attribute name="supportsexternalfilereferences">true</attribute>
+                        </task>
+                        <task name="delay-sign">
+                            <attribute name="exename">sn</attribute>
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="license">
+                            <attribute name="hascommandlinecompiler">false</attribute>
+                        </task>
+                        <task name="ilasm">
+                            <attribute name="managed">true</attribute>
+                        </task>
+                    </tasks>
+                </framework>
+                <framework
+                    name="mono-4.5"
+                    family="mono"
+                    version="4.5"
+                    description="Mono 4.5 Profile"
+                    sdkdirectory="${toolDirectory}"
+                    frameworkdirectory="${toolDirectory}"
+                    frameworkassemblydirectory="${path::combine(prefix, 'lib/mono/4.5')}"
+                    clrversion="4.0.30319"
+                    clrtype="Desktop"
+                    vendor="Mono"
+                    >
+                    <runtime>
+                        <probing-paths>
+                            <directory name="lib/mono/2.0" />
+                            <directory name="lib/mono/neutral" />
+                            <directory name="lib/common/2.0" />
+                            <directory name="lib/common/neutral" />
+                        </probing-paths>
+                        <modes>
+                            <auto>
+                                <engine program="${path::combine(prefix, 'bin/mono')}" />
+                            </auto>
+                            <strict>
+                                <engine program="${path::combine(prefix, 'bin/mono')}">
+                                    <arg value="--runtime=v4.0.30319" />
+                                </engine>
+                            </strict>
+                        </modes>
+                    </runtime>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/4.5')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/4.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/3.5')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/3.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/2.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <task-assemblies>
+                        <!-- include Mono version-neutral assemblies -->
+                        <include name="extensions/mono/neutral/**/*.dll" />
+                        <!-- include Mono 2.0 specific assemblies -->
+                        <include name="extensions/mono/2.0/**/*.dll" />
+                        <!-- include .NET 2.0 specific assemblies -->
+                        <include name="extensions/common/2.0/**/*.dll" />
+                    </task-assemblies>
+                    <tool-paths>
+                        <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/4.5')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/3.5')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/2.0')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/1.0')}" />
@@ -2734,13 +3048,22 @@
                         <property name="resgen.supportsexternalfilereferences" value="false" />
                         <property name="prefix" value="${pkg-config::get-variable('mono', 'prefix')}" />
                         <property name="toolDirectory" value="${path::combine(prefix, 'lib/mono/4.0')}" />
+                        <if test="${not(pkg-config::is-atleast-version('mono', '3.0'))}">
+                            <property name="csc.tool" value="dmcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${pkg-config::is-atleast-version('mono', '3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="4.5"/>
+                        </if>
                     </project>
                     <tasks>
                         <task name="al">
                             <attribute name="managed">true</attribute>
                         </task>
                         <task name="csc">
-                            <attribute name="exename">dmcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="langversion">linq</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
@@ -2824,6 +3147,7 @@
                     </task-assemblies>
                     <tool-paths>
                         <directory name="${toolDirectory}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/4.5')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/2.0')}" />
                         <directory name="${path::combine(prefix, 'lib/mono/1.0')}" />
                         <!-- unmanaged tools -->
@@ -2835,10 +3159,19 @@
                         </if>
                         <property name="prefix" value="${pkg-config::get-variable('mono', 'prefix')}" />
                         <property name="toolDirectory" value="${path::combine(prefix, 'lib/mono/2.1')}" />
+                        <if test="${not(pkg-config::is-atleast-version('mono', '3.0'))}">
+                            <property name="csc.tool" value="smcs"/>
+                            <property name="mcs.sdk" value="0"/>
+                        </if>
+                        <if test="${pkg-config::is-atleast-version('mono', '3.0')}">
+                            <property name="csc.tool" value="mcs"/>
+                            <property name="mcs.sdk" value="2.1"/>
+                        </if>
                     </project>
                     <tasks>
                         <task name="csc">
-                            <attribute name="exename">smcs</attribute>
+                            <attribute name="exename">${csc.tool}</attribute>
+                            <attribute name="mcssdk">${mcs.sdk}</attribute>
                             <attribute name="managed">true</attribute>
                             <attribute name="supportspackagereferences">true</attribute>
                             <attribute name="supportsnowarnlist">true</attribute>