Define __unix__ in genwrap.h for those OSs that don't define it by default

but are *NIX (MacOS and NetBSD so far)

src/xpdev/genwrap.h

@@ -38,6 +38,12 @@
 #ifndef _GENWRAP_H
 #define _GENWRAP_H
 
+#if (defined(__APPLE__) && defined(__MACH__) && defined(__POWERPC__)) || defined (__NetBSD__)
+#ifndef __unix__
+#define __unix__
+#endif
+#endif
+
 #include <stdio.h>		/* sprintf */
 #include "gen_defs.h"	/* ulong */
 #include "wrapdll.h"	/* DLLEXPORT and DLLCALL */