Honor the -DCMAKE_INSTALL_PREFIX directive

veg · May 17, 2018 · fe4586c · fe4586c
1 parent 3cc9c72
commit fe4586c
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -188,8 +188,12 @@ endif(NOT ${OPENMP_FOUND})
 #-------------------------------------------------------------------------------
 # default installation prefix
 #-------------------------------------------------------------------------------
-set(INSTALL_PREFIX /usr/local CACHE PATH "Installation prefix")
-set(CMAKE_INSTALL_PREFIX ${INSTALL_PREFIX} CACHE INTERNAL "Installation prefix" FORCE)
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+    set(CMAKE_INSTALL_PREFIX "/usr/local" CACHE PATH "Installation prefix")
+endif()
+if(NOT DEFINED INSTALL_PREFIX)
+    set(INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE INTERNAL "Installation prefix" FORCE)
+endif()
 if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
     set(DEFAULT_LIBRARIES pthread)
 else(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")