What is config.log in osx and where does it live?

Can someone explain what “configure” is and is there where a file config.logcan be found at all?

This is due to a specific problem ( gcc doesn't work - Xcode 3.2.6 - Snow Leopard ), but I thought this question might be of more general interest:

When I try to install rubies using RVM and, I think, maybe something related to the Xcode gcc compiler or perhaps even more general, if there are errors, then the logs usually refer to the file config.log. For instance. in mine /yaml/configure.logi get:

configure: error: in `/Users/duncanstuart/.rvm/src/yaml-0.1.4':
configure: error: C compiler cannot create executables
See `config.log' for more details

A Google search suggests that this file is specific to the package being installed, but various messages provide several different locations, none of which exist on my computer - for example, Error installing PostgreSQL on Mac OS X 10.5 using MacPorts says that it is located somewhere under/opt/local/var/

Unable to install Ruby under Lion with RVM problems - GCC contains an example config.logthat states:

This file contains all messages generated by compilers during configure to help debug if configure makes a mistake.

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configure - , , , .. . / .

( ) autoconf configure.ac( configure.in).

config.log - , . configure, " " /Users/duncanstuart/.rvm/src/yaml-0.1.4 (, , , ).

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