--- include/OpenIPMI/selector.h.orig	2020-08-20 14:50:15.000000000 -0500
+++ include/OpenIPMI/selector.h	2020-08-20 14:50:54.000000000 -0500
@@ -34,6 +34,7 @@
 #ifndef SELECTOR
 #define SELECTOR

+#include <sys/signal.h> /* for sigset_t */
 #include <sys/types.h> /* For timeval */
 #include <sys/time.h> /* For timeval */