change convert netpbm with gnu source

diff --git a/src/kds_s2000w_image_converter_netpbm.c b/src/kds_s2000w_image_converter_netpbm.c
index 1569731901b72a8962932fc105193271af24067b..6cfdadf9442f70e706a4bbd1b6fd08e8a21f2b39 100644 (file)
--- a/src/kds_s2000w_image_converter_netpbm.c
+++ b/src/kds_s2000w_image_converter_netpbm.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <string.h>
 #include <netpbm/pnm.h>