I've created an update of prereq from 0.3 to 0.4 which does the 
preliminary checks of the Sage build.

http://sagetrac.org/sage_trac/ticket/7021

The main benefits are:

* gcc is checked that the version is at least 4.0.1

* If you try to mix versions of gcc and g++ (say gcc 4.0.2 and gcc 
4.1.0), then you get an error.

* A warning is issued on OS X to use the latest XCode

* One can build with the Sun compiler if one wishes, as the configure 
script no longer exits, but just issues a warning about only gcc being 
supported.

* If you try to mix GNU and non-GNU C or C++ compilers, then you get an 
error (Fortran is not covered properly. I will look at improving that 
later. It is not so easy as C and C++).


The update consists of two files, which should be installed as:

     * $SAGE_HOME/spkg/base/prereq-0.4-install
     * $SAGE_HOME/spkg/base/prereq-0.4.tar


The files are attached to the ticket


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