trying to fix problem that only occurs in mac builds

diff --git a/lib/gvc/gvcproc.h b/lib/gvc/gvcproc.h
index caa05fd659033482c7f48ceae9e5f6be9af274a4..37bac1e384150761b0b6d12d49dd260aa110bbf4 100644 (file)
--- a/lib/gvc/gvcproc.h
+++ b/lib/gvc/gvcproc.h
@@ -69,6 +69,7 @@ extern "C" {
 
 /* device */
 
+    extern size_t gvdevice_write (GVJ_t * job, const unsigned char *s, unsigned int len);
     extern void gvdevice_fputs(GVJ_t * job, char *s);
     extern void gvdevice_printf(GVJ_t * job, const char *format, ...);