From: Nathan Phillip Brink <ohnobinki@ohnopublishing.net>

Support glibc systems where SIGRTMAX and SIGRTMIN macros can only be fully expanded at runtime.

--- a/source/mksiginc.c
+++ b/source/mksiginc.c
@@ -191,12 +191,18 @@
 	signames[SIGRETRACT] = "RETRACT";
 #endif
 
-#if defined(SIGRTMAX) && SIGRTMAX < MY_MAXSIG
-	signames[SIGRTMAX] = "RTMAX";
+#if defined(SIGRTMAX)
+	/*
+	 * In recent glibc, SIGRTMAX and SIGRTMIN macros are runtime
+	 * function calls into libc and must be evaluated at runtime.
+	 */
+	if (SIGRTMAX < MY_MAXSIG)
+		signames[SIGRTMAX] = "RTMAX";
 #endif
 
-#if defined(SIGRTMIN) && SIGRTMIN < MY_MAXSIG
-	signames[SIGRTMIN] = "RTMIN";
+#if defined(SIGRTMIN)
+	if (SIGRTMIN < MY_MAXSIG)
+		signames[SIGRTMIN] = "RTMIN";
 #endif
 
 #if defined(SIGSAK) && SIGSAK < MY_MAXSIG