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--- a/sct.c 2017-09-22 00:44:20.270421881 +0000
+++ b/sct.c 2017-09-26 10:50:38.964562740 +0000
@@ -36,6 +36,7 @@
main(int argc, char **argv)
{
Display *dpy = XOpenDisplay(NULL);
+ if (!dpy) exit(1);
int screen = DefaultScreen(dpy);
Window root = RootWindow(dpy, screen);
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