diff --git a/apps/sample/polygonmesh_optimize/polygonmesh_optimize.pro b/apps/sample/polygonmesh_optimize/polygonmesh_optimize.pro
index bb127a8c..1bbfbcf3 100644
--- a/apps/sample/polygonmesh_optimize/polygonmesh_optimize.pro
+++ b/apps/sample/polygonmesh_optimize/polygonmesh_optimize.pro
@@ -1,7 +1,3 @@
-\macx: QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.9
-QMAKE_MAC_SDK = macosx10.9
-CONFIG += c++11
-
 include(../common.pri)
 TARGET = polygonmesh_base
 SOURCES += polygonmesh_optimize.cpp ../../../wrap/ply/plylib.cpp