--- config.h.orig	Sat Jun  1 08:54:49 1996
+++ config.h	Sat Mar  7 13:17:30 1998
@@ -325,6 +325,18 @@
   #define rindex(s,c) strrchr(s,c)
 #endif
 
+#ifdef __NetBSD__
+#  include <errno.h>
+#  include <math.h>
+#  define PI M_PI
+#endif
+
+#ifdef sgi
+#  include <errno.h>
+#  include <math.h>
+#  define PI M_PI
+#endif
+
 #ifdef __WIN32__
 #  include <math.h>
 #  define PI M_PI