PHP: fix pecl installation error for fiinding address_sorting.h
diff --git a/config.m4 b/config.m4
index d7cda0b..dfdbd0f 100644
--- a/config.m4
+++ b/config.m4
@@ -8,6 +8,7 @@
   PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/include)
   PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/src/php/ext/grpc)
   PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/third_party/boringssl/include)
+  PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/third_party/address_sorting/include)
 
   LIBS="-lpthread $LIBS"