nginx-0.0.2-2004-02-24-20:31:46 import
diff --git a/auto/threads b/auto/threads
index 71fbcb6..0c677f1 100644
--- a/auto/threads
+++ b/auto/threads
@@ -1,7 +1,13 @@
 
 if [ $USE_THREADS = "rfork" ]; then
+
     have=NGX_THREADS . auto/have
     have=USE_RFORK . auto/have
     CORE_DEPS="$CORE_DEPS $UNIX_THREADS_DEPS"
     CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_SRCS"
+
+    if [ $version -lt 501000 ]; then
+        CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_THREAD_SRCS"
+    fi
+
 fi