based onhttps://830833.bugs.gentoo.org/attachment.cgi?id=761676,
adjusted for 1.7.2

--- a/configure.in	2022-01-09 00:31:05.552582255 -0800
+++ b/configure.in	2022-01-09 00:31:19.824582533 -0800
@@ -1329,7 +1329,7 @@
             return 3;
         }
         return 0;
-    }], [], [ac_cv_file__dev_zero=no], [ac_cv_file__dev_zero=no])])
+    }], [], [ac_cv_file__dev_zero=no], [:])])
 fi
 
 # Now we determine which one is our anonymous shmem preference.