diff --git a/config.h b/config.h
index 20e32fd..f821c0a 100644
--- a/config.h
+++ b/config.h
@@ -6,3 +6,5 @@
 #define USE_OPENMP
 #define USE_PNG
 #define USE_JASPER
+#define CC gcc
+#define HDF5 system