diff --git a/src/ssg/ssgLoadFLT.cxx b/src/ssg/ssgLoadFLT.cxx
--- a/src/ssg/ssgLoadFLT.cxx
+++ b/src/ssg/ssgLoadFLT.cxx
@@ -112,6 +112,10 @@
 # include <sys/stat.h>
 # include <sys/mman.h>
 #endif
+#if defined(__APPLE__)
+typedef unsigned int uint;
+typedef unsigned short ushort;
+#endif
 #ifdef UL_MSVC
 # include <io.h>
 #endif