[Rubygems-developers] How to rebuild a gem

Eric Hodel drbrain at segment7.net
Wed Jan 21 17:50:28 EST 2009

On Jan 19, 2009, at 07:47 AM, Han Holl wrote:

> I want to install a gem, but it doesn't build on my platform.
> I fix the C-source, and submit a patch to the owner.
> But I want to go on, and not wait for the maintainer to apply my  
> patch.
> How can I rebuild the gem, and install.
> I tried to untar the original gem, untar data.tar.gz, drop in my .c  
> file, and
> tar it up again, but this doesn't work. I get an error message the  
> some
> directory already exists. I rm -rf'ed everything in the gem  
> directory tree
> that belonged to this gem, but still the same error.
> Is there a way to do this ?

$ gem install thegem # => it fails and gives you a path to gem_make.out
$ cd /to/the/path
$ patch < /path/to/your/patch
$ make # or whatever is appropriate for `gem spec thegem | grep -A2  

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