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# Quick porting guide for simple packages
*If you want to help port a package with simple issues to the Hurd, please read on.*
*just imagine joe C-doodler stumbling over some GNU philosophy and thinking “hey, I’ve got 2 free hours, why not help the Hurd?”*
*for him I’d like to have a guide (and for me, the faulty-memory-does-too-many-things :) )*
*a short guide “how to do simple ports” broken down to command line level: how to get the list of simple packages (youpi told me that here), how to get the source, how to test the fix, how to submit the fix.*
## Setup an instant Hurd development environment
See [[Instant Development Environment|contributing#index5h2]] - just follow the command to get a Hurd running in Qemu.
## Getting the list of failed packages
wget http://people.debian.org/~sthibault/hurd-i386/failed_packages.txt.gz
gunzip failed_packages.txt.gz
## Finding a simple task
grep PATH_MAX failed_packages.txt -B 2
Each of these packages is likely to be simple to fix. The output looks like this:
…
--
tex/lilypond_2.12.3-7 by buildd_hurd-i386-mozart [optional:uncompiled:bp{-100}:calprio{-63}:days{258}]
Reasons for failing:
> file-name.cc:88: error: 'PATH_MAX' was not declared in this scope
--
…
in this case, lilypond is the package.
Other simple tasks can be found on [[hurd/porting/guidelines]].
## Downloading the package source and installing dependencies
apt source PACKAGE
apt build-dep PACKAGE
For example
apt source lilypond
apt build-dep lilypond
## Fix the package
See [[hurd/porting/guidelines]] for help on fixing the package.
Notes:
* char path[4096] is evil. Use dynamic allocation (if you can).
* use stuff like if (x < sysconf(_SC_PATH_MAX)) {}
* if need be, make it conditional
\#ifdef PATH_MAX
old, POSIX-violating code
\#else
GNU, better code
\#endif
## Test the fix (compile, run tests)
cd PACKAGE
dpkg-buildpackage -B
Also check the packages README for instructions.
## Submit the fix
See [[hurd/running/debian/patch_submission]].
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