https://bugs.gentoo.org/show_bug.cgi?id=458516

--- FreeImage/Source/FreeImage.h
+++ FreeImage/Source/FreeImage.h
@@ -141,8 +141,10 @@
 typedef uint16_t WORD;
 typedef uint32_t DWORD;
 typedef int32_t LONG;
+#ifndef _LIBRAW_TYPES_H
 typedef int64_t INT64;
 typedef uint64_t UINT64;
+#endif
 #else
 // MS is not C99 ISO compliant
 typedef long BOOL;