--- ./otherlibs/unix/unixsupport.c.original	2011-10-23 17:57:40.000000000 +0200
+++ ./otherlibs/unix/unixsupport.c	2011-10-23 18:09:09.000000000 +0200
@@ -165,7 +165,11 @@
 #define ESOCKTNOSUPPORT (-1)
 #endif
 #ifndef EOPNOTSUPP
-#define EOPNOTSUPP (-1)
+#  ifdef ENOTSUP
+#    define EOPNOTSUPP ENOTSUP
+#  else
+#    define EOPNOTSUPP (-1)
+#  endif
 #endif
 #ifndef EPFNOSUPPORT
 #define EPFNOSUPPORT (-1)
@@ -252,6 +256,11 @@
   int errconstr;
   value err;
 
+#if defined(ENOTSUP) && (EOPNOTSUPP != ENOTSUP)
+  if (errcode == ENOTSUP)
+    errcode = EOPNOTSUPP;
+#endif
+
   errconstr =
       cst_to_constr(errcode, error_table, sizeof(error_table)/sizeof(int), -1);
   if (errconstr == Val_int(-1)) {