diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf1b2cf..9731860 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,10 +88,7 @@ include_directories(${JPEG_INCLUDE_DIR})
 
 set(CMAKE_REQUIRED_INCLUDES ${JPEG_INCLUDE_DIR})
 set(CMAKE_REQUIRED_LIBRARIES ${JPEG_LIBRARY})
-CHECK_FUNCTION_EXISTS("jpeg_mem_src" jpeg_has_mem_src)
-if (jpeg_has_mem_src)
-	add_definitions(-DHAVE_JPEG_MEM_SRC)
-endif ()
+CHECK_FUNCTION_EXISTS("jpeg_mem_src" HAVE_JPEG_MEM_SRC)
 
 find_package(OGG REQUIRED)
 include_directories(${OGG_INCLUDE_DIR})
@@ -231,6 +228,11 @@ if (WIN32)
 	)
 endif()
 
+configure_file(
+    "${CMAKE_SOURCE_DIR}/config.h.in"
+    "${CMAKE_BINARY_DIR}/config.h"
+)
+
 message(STATUS "Building ${CMAKE_BUILD_TYPE} for ${os}.${cpu}")
 
 set(src_renderer
@@ -695,6 +697,7 @@ else()
 	)
 endif()
 
+include_directories(${CMAKE_BINARY_DIR})
 include_directories(${CMAKE_SOURCE_DIR})
 
 add_library(idlib STATIC ${src_idlib})
diff --git a/config.h.in b/config.h.in
new file mode 100644
index 0000000..a6cc325
--- /dev/null
+++ b/config.h.in
@@ -0,0 +1,6 @@
+#ifndef __DOOM3_CONFIG_H__
+#define __DOOM3_CONFIG_H__
+
+#cmakedefine HAVE_JPEG_MEM_SRC
+
+#endif
diff --git a/sys/platform.h b/sys/platform.h
index 1faae4c..bcc521f 100644
--- a/sys/platform.h
+++ b/sys/platform.h
@@ -29,6 +29,7 @@ If you have questions concerning this license or the applicable additional terms
 #ifndef __PLATFORM__
 #define __PLATFORM__
 
+#include "config.h"
 #include "framework/BuildDefines.h"
 
 /*