I tried to install the Rugged gem today on my Ubuntu 12.04 system and I got this error,
$ gem install -r rugged
Building native extensions. This could take a while...
ERROR: Error installing rugged:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.8 extconf.rb
-- tar zxvf libgit2-dist.tar.gz
-- make -f Makefile.embed
checking for main() in -lgit2_embed... yes
checking for git2.h... no
ERROR: Failed to build libgit2
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/ruby1.8
--with-git2_embedlib
--without-git2_embedlib
Gem files will remain installed in /var/lib/gems/1.8/gems/rugged-0.16.0 for inspection.
Results logged to /var/lib/gems/1.8/gems/rugged-0.16.0/ext/rugged/gem_make.out
It took some digging to find out what was going on, but if you check the bottom of the mkmf.log file you might notice a zlib error;
/var/lib/gems/1.8/gems/rugged-0.16.0/ext/rugged/vendor/libgit2-dist/include/git2/zlib.h:10:18: fatal error: zlib.h: No such file or directory
Some brief googling will show that this means we need to install the zlib1g-dev package,
$ sudo apt-get install zlib1g-dev
Now you should be able to install Rugged without problems.
$ sudo apt-get install -r rugged
And happyness was had by all!
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