Hi,

on my journey to create/update packages of the 1.7 release for Mac OS' 
(home)brew package manager (http://mxcl.github.com/homebrew/), I stumbled over 
a compilation error of elm due to missing 'clearenv'.

Attached is a patch that repairs the check for 'clearenv'.

Attachment: clear_env.diff
Description: Binary data

I don't know why it wouldn't work with AC_TRY_COMPILE, but somehow 
HAVE_CLEARENV was defined, though it shouldn't have been (Mac OS Mountain Lion 
here).
I've manually tried to compile the snipped that AC_TRY_COMPILE should compile 
and it failed.

Using AC_CHECK_FUNCS works, so I'm suggesting to go with it.

Please anybody apply it, as I don't have my ssh key around. Backport?

--
Leif
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