diff -Nurd marco-1.22.0/src/ui/theme.c marco-1.22.0.new/src/ui/theme.c --- marco-1.22.0/src/ui/theme.c 2019-02-08 08:51:33.000000000 -0600 +++ marco-1.22.0.new/src/ui/theme.c 2019-03-23 06:00:16.139892136 -0500 @@ -60,7 +60,7 @@ #include <gtk/gtk.h> #include <string.h> #include <stdlib.h> -#define __USE_XOPEN +#define _XOPEN_SOURCE #include <math.h> #define GDK_COLOR_RGBA(color) \