diff --git a/macros.pl b/macros.pl
index 165d09f7..dd9c9618 100755
--- a/macros.pl
+++ b/macros.pl
@@ -47,7 +47,9 @@ print OUT "\n";
 print OUT "#include \"tables.h\"\n";
 print OUT "#include \"nasmlib.h\"\n";
 print OUT "#include \"hashtbl.h\"\n";
+print OUT "#include \"outform.h\"\n";
 print OUT "\n";
+print OUT "#if 1\n";
 print OUT "const unsigned char nasm_stdmac[] = {";
 
 my $npkg = 0;
@@ -71,9 +73,15 @@ foreach $fname ( @ARGV ) {
 	    undef $pkg;
 	    my @out_alias = split(/\s+/, $1);
 	    printf OUT "        /* %4d */ 0\n", $index++;
-	    print OUT "};\n";
+	    print OUT "};\n#endif\n";
 	    $index = 0;
-	    printf OUT "const unsigned char %s_stdmac[] = {\n", $out_alias[0];
+	    print OUT "\n";
+	    my $pfx = '#if';
+	    foreach my $al (@out_alias) {
+		print OUT $pfx, " defined(OF_\U${al}\E)";
+		$pfx = ' ||';
+	    }
+	    printf OUT "\nconst unsigned char %s_stdmac[] = {\n", $out_alias[0];
 	    print  OUT "    /* From $fname */\n";
 	    $lastname = $fname;
 	    push(@out_list, $out_alias[0]);
@@ -84,8 +92,9 @@ foreach $fname ( @ARGV ) {
 		die "$0: $fname: duplicate package: $pkg\n";
 	    }
 	    printf OUT "        /* %4d */ 0\n", $index++;
-	    print OUT "};\n";
+	    print OUT "};\n#endif\n";
 	    $index = 0;
+	    print OUT "\n#if 1\n";
 	    printf OUT "static const unsigned char nasm_stdmac_%s[] = {\n", $pkg;
 	    print  OUT "    /* From $fname */\n";
 	    $lastname = $fname;
@@ -126,7 +135,7 @@ foreach $fname ( @ARGV ) {
     }
     close(INPUT);
 }
-printf OUT "        /* %4d */ 0\n};\n\n", $index++;
+printf OUT "        /* %4d */ 0\n};\n#endif\n\n", $index++;
 print OUT "const unsigned char * const nasm_stdmac_after_tasm = ",
     "&nasm_stdmac[$tasm_count];\n\n";