ngx_http_image_filter_module
diff --git a/auto/lib/conf b/auto/lib/conf
index 0462228..a4155e1 100644
--- a/auto/lib/conf
+++ b/auto/lib/conf
@@ -45,6 +45,10 @@
     . auto/lib/libxslt/conf
 fi
 
+if [ $USE_LIBGD = YES ]; then
+    . auto/lib/libgd/conf
+fi
+
 if [ $USE_PERL = YES ]; then
     . auto/lib/perl/conf
 fi