backout the previous commit
diff --git a/auto/cc/bcc b/auto/cc/bcc
index d7946f5..83b2d60 100644
--- a/auto/cc/bcc
+++ b/auto/cc/bcc
@@ -39,10 +39,10 @@
 
 
 # precompiled headers
-#CORE_DEPS="$CORE_DEPS $NGX_OBJS/ngx_config.csm"
-#NGX_PCH="$NGX_OBJS/ngx_config.csm"
-#NGX_BUILD_PCH="-H=$NGX_OBJS/ngx_config.csm"
-#NGX_USE_PCH="-Hu -H=$NGX_OBJS/ngx_config.csm"
+CORE_DEPS="$CORE_DEPS $NGX_OBJS/ngx_config.csm"
+NGX_PCH="$NGX_OBJS/ngx_config.csm"
+NGX_BUILD_PCH="-H=$NGX_OBJS/ngx_config.csm"
+NGX_USE_PCH="-Hu -H=$NGX_OBJS/ngx_config.csm"
 
 
 # Win32 GUI mode application