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Install numpy on Snow Leopard

When I try to install numpy over a python.org python2.6 installation, I get these errors on my OS X terminal.
sh: gcc-4.2: command not found
And this causes failure. I noticed a pastebin (http://pastebin.com/hieSKe3A) already on this issue but I'm unable to find an answer online that works for Snow Leopard (there seem to be a lot of answers for Lion).
I noticed numpy requires the python.org python2.6 installation. I'm trying to do that. Btw, if there is a way for me to prevent the installer of the numpy mpkg from checking the python version available? (If yes, I may have another hacky way to do this.)
Help?
Thanks.

You have two main options to install gcc 4.2 on Snow Leopard:
Download pre-built binaries from osx-gcc-installer. This is the simplest way.
Download the Command Line Tools for Xcode package in the Developer Center and follow this guide to make it install on Snow Leopard.

In terminal type “gcc“, you will get message “command not found”.
C or GCC compiler is needed some times and MAC OS X does not have this installed by default
to install gcc compiler you will need to download and install command line tools for xcode (see Apples developer page)

Cannot easy_install readline for Python 2.7.3 on Mac Os Lion

I am trying to install the python readline module. I have already installed readline via homebrew.
If I type
easy_install readline
I get
Downloading http://pypi.python.org/packages/source/r/readline/readline-6.2.2.tar.gz#md5=ad9d4a5a3af37d31daf36ea917b08c77
Processing readline-6.2.2.tar.gz
Writing /var/folders/44/dhrdb5sx53s243j4w03063vh0000gn/T/easy_install-64FbG8/readline-6.2.2/setup.cfg
Running readline-6.2.2/setup.py -q bdist_egg --dist-dir /var/folders/44/dhrdb5sx53s243j4w03063vh0000gn/T/easy_install-64FbG8/readline-6.2.2/egg-dist-tmp-NOmStB
clang: error: no such file or directory: 'readline/libreadline.a'
clang: error: no such file or directory: 'readline/libhistory.a'
error: Setup script exited with error: command '/usr/bin/clang' failed with exit status 1
Any ideas about how I could fix this ?
Thanks

There is a new solution to this problem in Pypi, pip install gnureadline.
https://pypi.python.org/pypi/gnureadline
The root issue is libedit (BSD-licensed) vs. Gnu Readline (GPL-licensed) . Apple would rather provide incompatible BSD code, than provide compatible code that has GPL restrictions.

This bug should be fixed in readline version 6.2.4 released last week.
Also note that you do not need to install the readline library itself via homebrew. It is already included within the python readline module.
Anyone having problems with the python-readline module is welcome to open an issue on the GitHub page of the module. This will ensure that the problem is permanently solved for everyone.

I had this same problem in OS X Lion 10.8, and fixed it by renaming my /Developer to /Developer-old. See this issue.

None of the above worked from me.
After uninstall ipython and readline, I ran the following that finally worked
easy_install http://pypi.python.org/packages/source/r/readline/readline-6.1.0.tar.gz
pip install ipython
And yes, readline 6.1.0 is an old one, but 6.2.x or other would not work (in sept 2013).

Try installing the binary egg directly:
$ easy_install http://pypi.python.org/packages/2.7/r/readline/readline-6.2.2-py2.7-macosx-10.7-intel.egg#md5=25383d860632d4a1521961ba68a52fe2

Make sure you have gcc installed.
which gcc
should return
/usr/bin/gcc
I was getting the same error when trying to easy_install readline. It wasn't until I downloaded the tar and tried to manually build it that I noticed it said
checking whether make sets $(MAKE)... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/Users/roneill/readline-6.2.4.1/rl/readline-lib':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details.
that I realized what the actual problem was. I had not used this particular laptop in a while and had not used Xcode to install the command line tools. Once I did, things worked properly.

Why am I getting the error: command 'llvm-gcc-4.2' failed with exit status 1

I am setting up os X 10.7.
I am using the default install of Python:
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/
I use a Python based package manager called easy_install.
Easy_install seems to not be able to find the compiler.
EDIT: When I tried to install MySQL-python I got this error:
$ sudo easy_install MySQL-python
Password:
Searching for MySQL-python
Reading http://pypi.python.org/simple/MySQL-python/
Reading http://sourceforge.net/projects/mysql-python/
Reading http://sourceforge.net/projects/mysql-python
Best match: MySQL-python 1.2.3
Downloading http://download.sourceforge.net/sourceforge/mysql-python/MySQL-python-1.2.3.tar.gz
Processing MySQL-python-1.2.3.tar.gz
Running MySQL-python-1.2.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-P9H9WX/MySQL-python-1.2.3/egg-dist-tmp-rRTfZL
warning: no files found matching 'MANIFEST'
warning: no files found matching 'ChangeLog'
warning: no files found matching 'GPL'
unable to execute llvm-gcc-4.2: No such file or directory
error: Setup script exited with error: command 'llvm-gcc-4.2' failed with exit status 1
error: Setup script exited with error: command 'llvm-gcc-4.2' failed with exit status 1
Xcode 4.1 used GCC, but with Xcode 4.2 that seems to have changed.
What compiler does Apple want us to use?
How do I setup the configuration so I can compile OSS?

I had the exact same problem when I upgraded from OSX 10.6 to 10.7. If you upgrade to 10.7 from 10.6, your version of Python may go from 2.6 to 2.7 and a result you may need to re-install most of your python packages.
Here's what worked for me:
Install the latest version of XCode from the App Store
Inside XCode, go to Preferences -> Downloads -> Components
download the Command Line Tools
That's all you need to do. Try to install again in a new shell. The command line tool installation will put llvm-gcc-4.2 into /usr/bin which should be in your default path. The installation also takes care of library paths and stuff that you don't really want to know about unless something breaks.
10.9 edit
If you're running 10.9 or higher, I think you might be able to run this from the command line instead to install the command line tools:
xcode-select --install
I haven't verified that this is an actual fix to the problem.

Alternative to installing Xcode, install GCC and related tools via:
https://github.com/kennethreitz/osx-gcc-installer

Sounds to me you ran into this issue. The thread shows a variety of solutions.
Hope that helps.

The fix is quite simple. Check out the following blogpost.
http://waqasshabbir.tumblr.com/post/19073648382/llvm-gcc-4-2-exe-error-on-mac-osx-lion-when-building

Using OS X 10.7.5 (Lion)
I tried the XCode solution, but my gevent pip installation still wasn't successful. Then, I tried building libevent from source but still no success with gevent installation. However, after I did
brew install libevent
I was able to successfully install gevent with
sudo pip install gevent
(Note: greenlet is also a dependency for gevent, so you may try installing it with pip as well. It was already installed on my machine.)

All of the suggestions here (Xcode command line options, and Kenneth Reitz' stuff) didn't work for me (I am on Mac OS X 10.7.5, Xcode 4.6.3).
What helped in the end was altering the cflags options in the mysql_config file (There were errors about 'unreconized command line options' while trying to 'sudo pip install MySQL-python').
See this post: cc1: error: unrecognized command line option "-Wno-null-conversion" within installing python-mysql on mac 10.7.5

Homebrew failing to install postgresql; python 64-bit errors

I'm getting errors when running
$ brew install postgresql
==> Downloading http://ftp.postgresql.org/pub/source/v9.1.2/postgresql-9.1.2.tar.bz2
File already downloaded in /Users/neil/Library/Caches/Homebrew
Warning: Detected a framework Python that does not have 64-bit support in:
/Library/Frameworks/Python.framework/Versions/Current/Python
e configure script seems to prefer this version of Python over any others,
you may experience linker problems as described in:
http://osdir.com/ml/pgsql-general/2009-09/msg00160.html
fix this issue, you may need to either delete the version of Python
own above, or move it out of the way before brewing PostgreSQL.
te that a framework Python in /Library/Frameworks/Python.framework is
e "MacPython" version, and not the system-provided version which is in:
/System/Library/Frameworks/Python.framework
==> ./configure --disable-debug --prefix=/usr/local/Cellar/postgresql/9.1.2 --datadir=/usr/local/Cellar/postgresql/9.1.2/shar
^C
Here's where python is located.
$ which python
/usr/local/bin/python
I modified my ~/.zshrc PATH from
export PATH=/Library/Frameworks/Python.framework/Versions/2.7/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11/bin
to
export PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11/bin
And although I'm getting python 64-bit errors, my version of python is 64-bit according to this SO post:
$ python -c 'import struct;print( 8 * struct.calcsize("P"))'
64

The problem pointed out in the referenced mailing list post is that the configure step isn't impacted by the PATH here. There's a whole other mechanism used to find things to link against; see Where do I set DYLD_LIBRARY_PATH on Mac OS X for a quick intro. You could try the suggested workaround given by the brew script--rename /Library/Frameworks/Python.framework/Versions/Current/Python to something else to get it out of the linker's search path, repeat the brew install, then put it back.

If you don't need Python bindings in your PostgreSQL, you can also just install it without Python bindings using brew install postgresql --no-python.

This command is installing the server, not the python bindings. Is that what you want? There is a installer for osx that will install the server for you.
Once you have done that, you can install the psycopg2 bindings directly from source.

Switching gcc version on mac

I have the newest XCode (4D199) installed and in terminal when I type
new-host-2: me$ gcc -version
i686-apple-darwin11-llvm-gcc-4.2: no input files
Is that the default xcode/mac gcc compiler version? Because when I try to do a
sudo easy_install cython
I get:
Running Cython-0.15.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-qS3Kqb/Cython-0.15.1/egg-dist-tmp-Zh0Vnv
cc1: error: unrecognized command line option "-arch"
cc1: error: unrecognized command line option "-arch"
I've read that -arch is a Apple GCC compiler only function. I think when I installed a port from macports I remember it installing something called "llvm" and now I suspect that that is being used instead of the one that comes with XCODE.
Any way to switch it back?
Oh, and when I type "sudo port select gcc" I get (this might be relevent to knowing which gcc version I have):
Available versions for gcc:
apple-gcc42
gcc42
llvm-gcc42
mp-gcc44
mp-llvm-gcc42
none

Does sound like you're getting a non-apple version. If you don't need any non-standard compilers, I'd remove any that macports has installed. The apple infrastructure is different enough that using compilers from macports causes grief fairly easily.

This is not extremely related to your problem but you will find a solution here: Can't install Ruby under Lion with RVM – GCC issues
This answer was edited multiple times and now contains three alternative solutions. Skip to the end and try the simple “edit 3” solution first, it seems to work for most people.
You need a non-LLVM version of GCC, which is no longer included with XCode 4.2. Install it yourself (or downgrade to XCode 4.1 temporarily), then do CC=/usr/local/bin/gcc-4.2 rvm install 1.9.3 (substituting the path to your non-LLVM gcc).
Edit: https://github.com/kennethreitz/osx-gcc-installer/downloads may help for installing GCC.
Edit 2 (apparently the easiest solution): Alternatively you can try to add --with-gcc=clang to the arguments to configure for Ruby to use clang.
Edit 3: rvm install 1.9.3 --with-gcc=clang does that for you.