diff -urN perl-5.6.1.orig/ext/Errno/Errno_pm.PL perl-5.6.1/ext/Errno/Errno_pm.PL
--- perl-5.6.1.orig/ext/Errno/Errno_pm.PL	Sun Apr  8 08:09:16 2001
+++ perl-5.6.1/ext/Errno/Errno_pm.PL	Thu Apr 12 20:58:53 2001
@@ -37,6 +37,13 @@
             warn "Cannot open '$file'";
             return;
 	}     
+    } elsif ($^O eq 'linux') {
+	# With the -dM option option, gcc outputs every #define's it finds
+	my $cpp = default_cpp();
+	unless(open(FH, "$cpp -dM < $file |")) {
+            warn "Cannot open '$file'";
+            return;
+	}
     } else {
 	unless(open(FH,"< $file")) {
 	    # This file could be a temporary file created by cppstdin