diff -ur libutempter-1.1.6/iface.c libutempter-1.1.6.patched/iface.c
--- libutempter-1.1.6/iface.c	2010-11-04 18:14:53.000000000 +0100
+++ libutempter-1.1.6.patched/iface.c	2018-06-06 15:09:11.417755549 +0200
@@ -60,9 +60,9 @@
 		_exit(EXIT_FAILURE);
 	}
 
-	execv(path, argv);
+	execvp(path, argv);
 #ifdef	UTEMPTER_DEBUG
-	fprintf(stderr, "libutempter: execv: %s\n", strerror(errno));
+	fprintf(stderr, "libutempter: execvp: %s\n", strerror(errno));
 #endif
 
 	while (EACCES == errno)
@@ -79,7 +79,7 @@
 		if (setgid(sgid))
 			break;
 
-		(void) execv(path, argv);
+		(void) execvp(path, argv);
 		break;
 	}
 
Only in libutempter-1.1.6.patched: result