apparently gnu caddr_t is supposed to be char *, not unsigned long

this type should never be used anyway, but some old junk uses it..

include/sys/types.h

@@ -59,7 +59,7 @@ typedef __uint32_t u_int32_t;
 typedef __uint64_t u_int64_t;
 
 #ifdef _GNU_SOURCE
-typedef unsigned long caddr_t;
+typedef char *caddr_t;
 typedef unsigned char u_char;
 typedef unsigned short u_short, ushort;
 typedef unsigned u_int, uint;