=== modified file 'plugin-runner.c'
--- plugin-runner.c	2019-07-07 19:15:30 +0000
+++ plugin-runner.c	2019-07-07 20:50:21 +0000
@@ -586,7 +586,11 @@
       if(arg[0] == '\0'){
 	break;
       }
+#if __GNUC__ >= 7
       __attribute__((fallthrough));
+#else
+	  /* FALLTHROUGH */
+#endif
     default:
       return ARGP_ERR_UNKNOWN;
     }