--- gc-7.1/configure.ac.orig	2008-10-24 15:44:08.000000000 +0100
+++ gc-7.1/configure.ac	2008-10-24 15:43:43.000000000 +0100
@@ -189,6 +189,7 @@
     AC_DEFINE(GC_WIN32_THREADS)
     dnl Wine getenv may not return NULL for missing entry
     AC_DEFINE(NO_GETENV)
+    win32_threads=true
     ;;
  dgux386)
     THREADS=dgux386