patch applied (packages/base): Allow additional options to pass on to ./configure to be given

[Ross Paterson]

On Fri, Apr 06, 2007 at 11:32:01AM -0700, Ian Lynagh wrote:
> Fri Apr  6 08:18:56 PDT 2007  Ian Lynagh <igloo at earth.li>
>   * Allow additional options to pass on to ./configure to be given
> 
>     M ./Setup.hs -8 +23
>     M ./configure.ac +11

configure now fails if no --with-cc option is given.  The problem is
that AC_PROG_CC doesn't work in conditionals: the first occurrence does
the sole expansions of _AC_COMPILER_EXEEXT and _AC_COMPILER_OBJEXT, and
the other branch misses out on the definitions they contain, so the C
compiler tests all fail.

Isn't the environment variable CC the usual way to specify the C
compiler to configure?