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diff -rauN slock/slock.c slock-tcc-patch/slock.c
--- slock/slock.c 2023-08-03 14:54:34.474038914 +0200
+++ slock-tcc-patch/slock.c 2023-08-03 14:54:56.284070903 +0200
@@ -348,8 +348,10 @@
die("slock: cannot open display\n");
/* drop privileges */
+#ifdef HAVE_SETGROUPS
if (setgroups(0, NULL) < 0)
die("slock: setgroups: %s\n", strerror(errno));
+#endif
if (setgid(dgid) < 0)
die("slock: setgid: %s\n", strerror(errno));
if (setuid(duid) < 0)
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