Implement exec -user, -group, and -newer. Enable find in defconfig.
diff --git a/lib/lib.h b/lib/lib.h
index 521a8d6..de5f547 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -119,6 +119,7 @@
 struct passwd *xgetpwuid(uid_t uid);
 struct group *xgetgrgid(gid_t gid);
 struct passwd *xgetpwnam(char *name);
+struct group *xgetgrnam(char *name);
 void xsetuser(struct passwd *pwd);
 char *xreadlink(char *name);
 long xparsetime(char *arg, long units, long *fraction);