gcc-4.2 failed with exit status 1

I've been looking for an answer to this issue but I couldn't find it, so here it is.

I'm trying to install Uniconvertor with a setup.py file into a MacOS X Lion (Python 2.7.2) using:

python setup.py install

Then I get the following error code:

running install
running build
running build_py
running build_ext
building 'uniconvertor.app.modules.streamfilter' extension
gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot /Developer/SDKs/MacOSX10.6.sdk -g -O2 -DNDEBUG -g -O3 -arch i386 -arch x86_64 -DMAJOR_VERSION=1 -DMINOR_VERSION=1 -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/modules/filter/streamfilter.c -o build/temp.macosx-10.6-intel-2.7/src/modules/filter/streamfilter.o
unable to execute gcc-4.2: No such file or directory
error: command 'gcc-4.2' failed with exit status 1

I looked for the 'gcc-4.2' file in the Developer/usr/bin folder and it wasn't there, but there's a 'llvm-gcc.4.2' file that makes me think I should change the compiler from 'gcc-4.2' to the 'llvm-gcc.4.2' one.

I'm kind of new to Mac and I don't know how else to fix it.



I tried using:

cd /Developer/usr/bin
ln -s llvm-gcc-4.2 gcc-4.2

And I get a little more progress, but then a new error:

running install_lib
creating /Library/Python/2.7/site-packages/uniconvertor
error: could not create '/Library/Python/2.7/site-packages/uniconvertor': Permission denied

What could be the cause of this 'Permission denied'?

I'm running it into an Admin account and it doesn't ask for a password or anything.

Thank you again.


Try the following:

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

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

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

xcode-select --install

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).

I tried @plusjeff answer, but Xcode 4.6 does not create a /Developer folder in the main directory anymore.

Therefore I sorted it out with a symlink:

sudo ln -s /Applications/Xcode.app/Contents/Developer /Developer

and it worked!

I have OSX 10.7.5 installed

Hope this helps!

I ran across this issue when installing a python library with pip.

After running xcode-select --install, I was still getting the issue.

So I created a symlink from "gcc" to "gcc-4.2" and that worked for me.

ln -s /Applications/Xcode.app/Contents/Developer/usr/bin/gcc /usr/local/bin/gcc-4.2

pip install --upgrade pip did not help fix the issue for me.

The answer by DanFreak didn't help me either, but it did give me the idea for what actually did work for me.

I got this error due to running an outdated version of pip. I ran pip install --upgrade pip and the error went away. Something to consider if you already have xcode command line tools installed and are still getting the error.

You will need the Xcode installed.

Go to Xcode -> Preferences -> Locations and choose the Command Line Tools.

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