I choose the wrong "make" executable when running cpan App::cpanminus for the first time. Now it is stuck at some error with the make file. I remember the configuration telling I can re-run the configuration with a command. Unfortunately I forget the command. Help? Where is the configuration stored, I am using git for windows mingw32.
From what I can tell, this isn't an App::cpanminus issue, you're asking how to reconfigure cpan itself. Here's how:
perl -MCPAN -e shell
cpan> o conf init
...make your changes, and your config will automatically be saved. If you don't get your desired results if you ran with the "automatic" run set to yes, say "no" to this question:
Would you like to configure as much as possible automatically?
...and then retry installing App::cpanminus