Commit Briefs
build: OS X 64-bit build
R=rsc http://codereview.appspot.com/4838047
9c, 9l: allow CC9=clang
R=rsc CC=codebot http://codereview.appspot.com/217045
INSTALL: fix build on Snow Leopard
http://codereview.appspot.com/116073
9l: platform-specific options first; AIX, Tru64 support
http://codereview.appspot.com/95050