diff --git a/Makefile b/Makefile
index 983d719..fc3c7e2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,17 @@
-CXX=g++-4.7
-# CPPFLAGS=-Wall -g
-# CPPFLAGS=-Wall -g -std=c++0x
+# may or may not work, most stuff okay on:
+# gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
+CXX=g++
 CPPFLAGS=-Wall -g -std=c++0x -pthread
 
+# works with g++-4.7:
+# CXX=g++-4.7
+# CPPFLAGS=-Wall -g -std=c++0x -pthread
+
+# works on clang (on ubuntu and mac) build following this:
+# http://solarianprogrammer.com/2011/10/16/llvm-clang-libc-linux/
+# CXX=clang++
+# CPPFLAGS=-Wall -g -std=c++0x -stdlib=libc++ -L/opt/clang/lib -pthread
+
 all: auto constexpr ilists init init_new lambda loops thread thread2 tuple
 
 run: all