diff --git a/src/ctpp2/src/Makefile.am.alt b/src/ctpp2/src/Makefile.am.alt
index 82ff0d2..a555ec7 100644
--- a/src/ctpp2/src/Makefile.am.alt
+++ b/src/ctpp2/src/Makefile.am.alt
@@ -84,9 +84,9 @@ libctpp2_la_SOURCES = \
 	CTPP2Util.cpp
 
 libctpp2_la_CXXFLAGS=-fPIC -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
-#if IS_OSX
-#libctpp2_la_CXXFLAGS+= -I/opt/local/include
-#endif
+if IS_OSX
+libctpp2_la_CXXFLAGS+= -I/opt/local/include
+endif
 
 libctpp2_la_LDFLAGS=