diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84c9b45..7b2d852 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,17 +81,22 @@ set(LDFLAGS
     ${_ALLTARGETS_LIBRARIES}
 )
 
+if(NOT HAVE_GETOPT_C)
+    set(EXT_DEPS gperf_ext)
+endif()
+set(EXT_DEPS ${EXT_DEPS} portaudio_ext)
+
 add_executable(run_assistant_text ${GOOGLEAPIS_CCS} ${CORE_SRCS} ${ASSISTANT_TEXT_SRCS})
 target_link_libraries(run_assistant_text ${LDFLAGS})
-add_dependencies(run_assistant_text portaudio_ext)
+add_dependencies(run_assistant_text ${EXT_DEPS})
 
 add_executable(run_assistant_file ${GOOGLEAPIS_CCS} ${CORE_SRCS} ${AUDIO_INPUT_FILE_SRCS} ${ASSISTANT_FILE_SRCS})
 target_link_libraries(run_assistant_file ${LDFLAGS})
-add_dependencies(run_assistant_file portaudio_ext)
+add_dependencies(run_assistant_file ${EXT_DEPS})
 
 add_executable(run_assistant_audio ${GOOGLEAPIS_CCS} ${CORE_SRCS} ${AUDIO_SRCS} ${ASSISTANT_AUDIO_SRCS})
 target_link_libraries(run_assistant_audio ${LDFLAGS} ${_PORTAUDIO_LIB})
-add_dependencies(run_assistant_audio portaudio_ext)
+add_dependencies(run_assistant_audio ${EXT_DEPS})
 
 if(APPLE)
     target_link_libraries(run_assistant_text "-framework CoreFoundation")
diff --git a/appveyor.yml b/appveyor.yml
index ecc8ccb..073f264 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -98,6 +98,7 @@ build_script:
           -DBUILD_NUMBER=%APPVEYOR_BUILD_NUMBER% %CMAKE_ARGS%
           ..
 
+  - set CL=/MP
   - cmake --build . --config %CONFIGURATION% --target all
 
 after_build:
diff --git a/cmake/build_dependencies.cmake b/cmake/build_dependencies.cmake
index 0ed48e6..4494e02 100644
--- a/cmake/build_dependencies.cmake
+++ b/cmake/build_dependencies.cmake
@@ -189,6 +189,6 @@ link_directories(
     ${_SSL_LIBRARIES_DIRS}
 )
 
-set(Protobuf_PROTOC_EXECUTABLE ${CMAKE_STAGING_PREFIX}/bin/protoc)
+set(Protobuf_PROTOC_EXECUTABLE ${CMAKE_STAGING_PREFIX}/bin/protoc${CMAKE_EXECUTABLE_SUFFIX})
 
 set(PROTO_BASE_PATH ${CMAKE_CURRENT_BINARY_DIR}/grpc_ext-prefix/src/grpc_ext/third_party/googleapis)
diff --git a/cmake/googleapis.cmake b/cmake/googleapis.cmake
index 16f50bb..9edcaca 100644
--- a/cmake/googleapis.cmake
+++ b/cmake/googleapis.cmake
@@ -1,6 +1,6 @@
 # Set grpc plugin
 if(NOT _gRPC_CPP_PLUGIN)
-    set(_gRPC_CPP_PLUGIN ${CMAKE_STAGING_PREFIX}/bin/grpc_cpp_plugin)
+    set(_gRPC_CPP_PLUGIN ${CMAKE_STAGING_PREFIX}/bin/grpc_cpp_plugin${CMAKE_EXECUTABLE_SUFFIX})
 endif()
 
 if(NOT _gRPC_PROTO_GENS_DIR)