Index: src/ath.h
--- src/ath.h.orig
+++ src/ath.h
@@ -46,6 +46,9 @@
 # ifdef HAVE_SYS_TYPES_H
 #  include <sys/types.h>
 # endif
+# ifdef HAVE_SYS_SELECT_H
+#  include <sys/select.h>
+# endif
 # include <sys/socket.h>
 
 #endif  /*!HAVE_W32_SYSTEM*/