https://bugs.gentoo.org/629774
--- a/src/prog/gpm-root.y	2012-10-26 17:21:38.000000000 -0400
+++ b/src/prog/gpm-root.y	2017-09-07 20:39:51.933264063 -0400
@@ -1197,7 +1197,7 @@
    /* reap your zombies */
    childaction.sa_handler=reap_children;
 #if defined(__GLIBC__)
-   __sigemptyset(&childaction.sa_mask);
+   sigemptyset(&childaction.sa_mask);
 #else /* __GLIBC__ */
    childaction.sa_mask=0;
 #endif /* __GLIBC__ */