--- mrxvt-0.5.4.orig/config.h.in	2008-05-12 10:22:41.000000000 +0000
+++ mrxvt-0.5.4/config.h.in	2019-07-20 14:34:53.628971562 +0000
@@ -655,3 +655,7 @@
 
 /* Define as `fork' if `vfork' does not work. */
 #undef vfork
+
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif