diff --git a/.DS_Store b/.DS_Store
index 9bb0cd5..ea8c9d1 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/code/.DS_Store b/code/.DS_Store
index 84687cd..4ff1f3f 100755
Binary files a/code/.DS_Store and b/code/.DS_Store differ
diff --git a/code/parallel/.DS_Store b/code/parallel/.DS_Store
index cc67364..dc3fc4d 100755
Binary files a/code/parallel/.DS_Store and b/code/parallel/.DS_Store differ
diff --git a/code/parallel/makefile_demo/Makefile b/code/parallel/makefile_demo/Makefile
index 811f4b3..66dee74 100755
--- a/code/parallel/makefile_demo/Makefile
+++ b/code/parallel/makefile_demo/Makefile
@@ -1,4 +1,4 @@
-CC 	 = g++ 
+CC 	 = g++ -std=c++11
 CFLAGS 	 = 
 LLIBS    = 
 LDFLAGS  =