https://github.com/qca/open-ath9k-htc-firmware/tree/master/local/patches/

Index: libcc1/connection.cc
--- libcc1/connection.cc.orig
+++ libcc1/connection.cc
@@ -21,6 +21,7 @@ along with GCC; see the file COPYING3.  If not see
 #include <string>
 #include <unistd.h>
 #include <sys/types.h>
+#include <sys/select.h>
 #include <string.h>
 #include <errno.h>
 #include "marshall.hh"