https://github.com/intel/gmmlib/pull/68
Index: Source/inc/portable_compiler.h
--- Source/inc/portable_compiler.h.orig
+++ Source/inc/portable_compiler.h
@@ -30,6 +30,9 @@ OTHER DEALINGS IN THE SOFTWARE.
     #endif
 
     #define __noop
+    #ifdef __fastcall
+        #undef __fastcall
+    #endif
     #define __fastcall
     #if defined __x86_64__
         #define __stdcall       // deprecated for x86-64
