closes https://github.com/assimp/assimp/issues/938: adapt instal pathes.

CMakeLists.txt

@@ -136,11 +136,11 @@ IF ( CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR )
 ENDIF ( CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR )
 
 # Cache these to allow the user to override them manually.
-SET( ASSIMP_LIB_INSTALL_DIR "lib" CACHE PATH
+SET( ASSIMP_LIB_INSTALL_DIR "lib" CACHE STRING
   "Path the built library files are installed to." )
-SET( ASSIMP_INCLUDE_INSTALL_DIR "include" CACHE PATH
+SET( ASSIMP_INCLUDE_INSTALL_DIR "include" CACHE STRING
   "Path the header files are installed to." )
-SET( ASSIMP_BIN_INSTALL_DIR "bin" CACHE PATH
+SET( ASSIMP_BIN_INSTALL_DIR "bin" CACHE STRING
   "Path the tool executables are installed to." )
 
 IF (CMAKE_BUILD_TYPE STREQUAL "Debug")

assimp.pc.in

@@ -1,5 +1,5 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=@CMAKE_INSTALL_PREFIX@/@ASSIMP_BIN_INSTALL_DIR@
+exec_prefix=@CMAKE_INSTALL_PREFIX@/
 libdir=@CMAKE_INSTALL_PREFIX@/@ASSIMP_LIB_INSTALL_DIR@
 includedir=@CMAKE_INSTALL_PREFIX@/@ASSIMP_INCLUDE_INSTALL_DIR@/assimp