Index: tcc.c
===================================================================
RCS file: /sources/tinycc/tinycc/tcc.c,v
retrieving revision 1.190
diff -u -r1.190 tcc.c
--- tcc.c	13 Dec 2007 19:07:20 -0000	1.190
+++ tcc.c	13 Dec 2007 23:02:39 -0000
@@ -10013,9 +10013,15 @@
     tcc_define_symbol(s, "arm", NULL);
     tcc_define_symbol(s, "__APCS_32__", NULL);
 #endif
-#if defined(linux)
+
+    /* target OS */
+#ifndef TCC_TARGET_PE
+    tcc_define_symbol(s, "__unix__", NULL);
+    tcc_define_symbol(s, "__unix", NULL);
+#if defined(__linux)
     tcc_define_symbol(s, "__linux__", NULL);
-    tcc_define_symbol(s, "linux", NULL);
+    tcc_define_symbol(s, "__linux", NULL);
+#endif
 #endif
     /* tiny C specific defines */
     tcc_define_symbol(s, "__TINYC__", NULL);