diff --git a/CMakeLists.txt b/CMakeLists.txt
index c2cab6e..cfa86eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -223,6 +223,23 @@ if (WIN32)
 	)
 endif()
 
+if (APPLE)
+	SET(bindir		"${CMAKE_INSTALL_PREFIX}")
+	SET(libdir		"${CMAKE_INSTALL_PREFIX}")
+	SET(datarootdir	"${CMAKE_INSTALL_PREFIX}")
+	SET(datadir		"${datarootdir}")
+elseif (WIN32)
+	SET(bindir		"${CMAKE_INSTALL_PREFIX}")
+	SET(libdir		"${CMAKE_INSTALL_PREFIX}/lib")
+	SET(datarootdir	"${CMAKE_INSTALL_PREFIX}")
+	SET(datadir		"${datarootdir}")
+else()
+	SET(bindir		"${CMAKE_INSTALL_PREFIX}/bin")
+	SET(libdir		"${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}/dhewm3")
+	SET(datarootdir	"${CMAKE_INSTALL_PREFIX}/share")
+	SET(datadir		"${datarootdir}/dhewm3")
+endif()
+
 configure_file(
     "${CMAKE_SOURCE_DIR}/config.h.in"
     "${CMAKE_BINARY_DIR}/config.h"
diff --git a/config.h.in b/config.h.in
index 9c0c951..b96976b 100644
--- a/config.h.in
+++ b/config.h.in
@@ -6,6 +6,9 @@
 
 #define BUILD_LIBRARY_SUFFIX	"@CMAKE_SHARED_LIBRARY_SUFFIX@"
 
+#define BUILD_LIBDIR			"@libdir@"
+#define BUILD_DATADIR			"@datadir@"
+
 #cmakedefine HAVE_JPEG_MEM_SRC
 
 #cmakedefine ID_ENABLE_CURL