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title: Gnulib
parent: FAQ
---
# How do I use and update Gnulib?
[Gnulib][gnulib] provides replacement implementations of functions that are
not available on all (Unix-like) operating systems. In order to sync with the
latest Gnulib code, do something like:
git clone git://git.savannah.gnu.org/gnulib.git
cd gnulib
GNULIB_HEAD=$(git rev-parse --short HEAD)
cd ..
git clone git@github.com:nagios-plugins/nagios-plugins.git
cd nagios-plugins
../gnulib/gnulib-tool --update
find gl -name '*~' -o -name '.gitignore' | xargs rm
git status
git add gl
git commit -m "Sync with latest Gnulib code ($GNULIB_HEAD)"
In order to make a given function available via Gnulib (on systems which don't
provide that function), the [corresponding module][modules] must be imported
using `gnulib-tool`, e.g. (in order to add the `strcase` module):
../gnulib/gnulib-tool --no-vc-files --import strcase
find gl -name '*~' | xargs rm
git status
git add gl
git commit -m 'Add Gnulib module "strcase"'
[gnulib]: http://www.gnu.org/software/gnulib/ "Gnulib"
[modules]: http://www.gnu.org/software/gnulib/MODULES.html "Gnulib Modules"
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