PHP: use a macro to specify extension src dir
diff --git a/config.m4 b/config.m4
index 12b1057..85549e5 100644
--- a/config.m4
+++ b/config.m4
@@ -5,9 +5,9 @@
dnl Write more examples of tests here...
dnl # --with-grpc -> add include path
- PHP_ADD_INCLUDE(../../grpc/include)
- PHP_ADD_INCLUDE(../../grpc/src/php/ext/grpc)
- PHP_ADD_INCLUDE(../../grpc/third_party/boringssl/include)
+ 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)
LIBS="-lpthread $LIBS"