OS X Mountain Lion: gcc-4.2 No such file or directory

Question

Tried to install a gem on Mountain Lion and make couldn\'t find gcc-4.2:

kamil$ gem install posix-spawn -v \'0.3.6\'
Building native extensions.  This could          


        

Answer 1

I had a similar issue while installing a python pip package (building a wheel failed). I got the similar message:

unable to execute '/usr/bin/gcc-4.2': No such file or directory
  error: command '/usr/bin/gcc-4.2' failed with exit status 1

Linking /usr/bin/gcc-4.2 to /usr/bin/gcc was not possible due to Apples System Integrity Protection (SIP), and linking it to /usr/local/bin/gcc-4.2 was not picked up by the wheel building process; it was still trying to use /usr/bin/gcc-4.2.

I was finally able to solve this by setting the CC variable in the terminal:

CC=/usr/bin/gcc
# Install your packages
pip install -r requirements.txt

PS : note that disabling SIP doesn't work, even with SIP disabled I wasn't able to create the /usr/bin/gcc-4.2 link.