gcc-4.2 failed with exit status 1

Solution 1:

Try the following:

1. Install the latest Xcode.
2. From Xcode's Preferences menu, install the Command Line Tools (Downloads/Components tab).

Solution 2:

I was able to resolve this by downloading one of these: https://github.com/kennethreitz/osx-gcc-installer/releases

Solution 3:

For newer versions of OS X (including macOS), you just need to open up a terminal and type:

xcode-select --install

Solution 4:

Try sudo python setup.py install.

Command line utilities will not ask you to escalate privileges and so must be run in sudo mode when the situation requires it (e.g., library installation into a global location).