Add python-dev requirements to 'easy' installation instructions

[tjd2002]

Under "Installing--the easy way", it would be nice to note that 'easy_install hg-git' requires the python development library (python-dev pacakge under Ubuntu 9.10) to be installed. Otherwise you get inscrutable error messages about errors compiling dulwich, such as:

$ sudo easy_install hg-git
Searching for hg-git
Reading http://pypi.python.org/simple/hg-git/
Reading http://hg-git.github.com/
Best match: hg-git 0.2.1
Downloading http://pypi.python.org/packages/source/h/hg-git/hg-git-0.2.1.tar.gz#md5=cad6487d5c887b15ea97951e885cf5ad
Processing hg-git-0.2.1.tar.gz
Running hg-git-0.2.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-eN8X8k/hg-git-0.2.1/egg-dist-tmp-4XoRA8
zip_safe flag not set; analyzing archive contents...
Adding hg-git 0.2.1 to easy-install.pth file

Installed /usr/local/lib/python2.6/dist-packages/hg_git-0.2.1-py2.6.egg
Processing dependencies for hg-git
Searching for dulwich>=0.4.0
Reading http://pypi.python.org/simple/dulwich/
Reading http://launchpad.net/dulwich
Reading http://samba.org/~jelmer/dulwich
Best match: dulwich 0.5.0
Downloading http://samba.org/~jelmer/dulwich/dulwich-0.5.0.tar.gz
Processing dulwich-0.5.0.tar.gz
Running dulwich-0.5.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-gIBNUZ/dulwich-0.5.0/egg-dist-tmp-GuQP5x
dulwich/_objects.c:20:20: error: Python.h: No such file or directory
dulwich/_objects.c:24: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
dulwich/_objects.c:36: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
dulwich/_objects.c:92: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘py_objects_methods’
dulwich/_objects.c: In function ‘init_objects’:
dulwich/_objects.c:99: error: ‘PyObject’ undeclared (first use in this function)
dulwich/_objects.c:99: error: (Each undeclared identifier is reported only once
dulwich/_objects.c:99: error: for each function it appears in.)
dulwich/_objects.c:99: error: ‘m’ undeclared (first use in this function)
dulwich/_objects.c:101: warning: implicit declaration of function ‘Py_InitModule3’
dulwich/_objects.c:101: error: ‘py_objects_methods’ undeclared (first use in this function)
dulwich/_objects.c:101: error: ‘NULL’ undeclared (first use in this function)
error: Setup script exited with error: command 'gcc' failed with exit status 1

[posborne]

Agreed. This bug report is the only thing that helped me make the connection.

[jagtesh]

Thanks for pointing out! You saved me an hour there. Couldn't have guessed before. But in hindsight, "Python.h: No such file or directory" was a big hint. A direct error message would've been better though. Perhaps having an explicit check for python-dev package would take care of that? I'm not sure as I've never used setuptools to create a package. Hope someone will look into this. Thanks!

[seanf]

Thanks, saved me some trouble too. I saw the same error on Fedora 13. The easy solution for me was to bypass Python.h with "yum install python-dulwich".

[carver]

I agree, pointing out the python-dev package is helpful.

I made a quick edit in a fork and requested a pull.
carver@8bb7dd0

[tjd2002]

Fixed in #5