Description: The various ruby-* packages built from ruby-gtk2 don't compile unless one runs "gem install pkg-config" as root before building them. Or, one need to install ruby-pkgconfig from AUR before building. In case the build fails, makepkg doesn't detect the failure and will make an empty package.
There are two alternative solutions to this problem:
1) put ruby-pkgconfig in Community and add it to makedepends;
2) check that the required binary has been built and in case of failure return 1, like this (from my AUR package ruby-gconf):

if [ ! -e gconf/src/gconf2.so ]; then
msg 'Build failed, perhaps you need to run gem install pkg-config as root'
return 1
fi

Also, it would be nice if you could build ruby-gtk2 and ruby-pango while ruby-rcairo is installed in the building system. This avoids problems ruby scripts that use cairo and pango code.

Additional info:
* package version(s) 0.90.5-1
* config and/or log files etc.


Steps to reproduce: