configure: error: C compiler cannot create executables in mac os terminal

Question

i\'m trying to Building libCURL in iOS 4.2, i do some steps in the terminal. The steps are :

1. cd curl-7.21.2
2. export CC=/Developer\\ 4.2/

Answer 1

If you are on Lion try installing with the tag: --with-gcc=clang

Running rvm requirements explains this in more detail:

Xcode 4.2:
 * is only supported by ruby 1.9.3+ using command line flag: --with-gcc=clang
 * it breaks gems with native extensions, especially DB drivers.

Xcode 4.2 users - please be warned - 
in case of any compilation issues 
 * downgrade to Xcode 4.1
 * or install osx-gcc-installer
and reinstall your rubies.