diff --git a/config.h.in b/config.h.in
index 39fcf5b..9c0c951 100644
--- a/config.h.in
+++ b/config.h.in
@@ -4,6 +4,8 @@
 #define BUILD_OS				"@os@"
 #define BUILD_CPU				"@cpu@"
 
+#define BUILD_LIBRARY_SUFFIX	"@CMAKE_SHARED_LIBRARY_SUFFIX@"
+
 #cmakedefine HAVE_JPEG_MEM_SRC
 
 #cmakedefine ID_ENABLE_CURL