hseara [1] filed a deletion request for gromacs-4.5-complete [2]:

This is an old version of gromacs which currently is very hard to install. In its current state does not compile. Moreover, I do not see why anybody should be still using this version. I'm the current maintainer. Please delete.

[1] https://aur.archlinux.org/account/hseara/ [2] https://aur.archlinux.org/pkgbase/gromacs-4.5-complete/