build: Experimental support to build using precompiled headers

This type of build needs to be explicitly enabled using --with-pch
configure option.

Change-Id: I02dc304187d54c3cf40f1d51b1b11b21f868e225
diff --git a/src/security/sec-rule-specific.hpp b/src/security/sec-rule-specific.hpp
index 21d00e6..2b7b355 100644
--- a/src/security/sec-rule-specific.hpp
+++ b/src/security/sec-rule-specific.hpp
@@ -8,6 +8,7 @@
 #ifndef NDN_SEC_RULE_SPECIFIC_H
 #define NDN_SEC_RULE_SPECIFIC_H
 
+#include "../common.hpp"
 #include "sec-rule.hpp"
 #include "../util/regex.hpp"