diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51a5578..b5c7d96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ add_definitions("-std=c++1y")
 add_executable(peglint lint/peglint.cc)
 add_executable(test-main test/test.cc)
 
-add_executable(calc example/calc.cc)
-add_executable(calc2 example/calc2.cc)
-add_executable(calc3 example/calc3.cc)
+#add_executable(calc example/calc.cc)
+#add_executable(calc2 example/calc2.cc)
+#add_executable(calc3 example/calc3.cc)