Arch Linux

Description:
lightdm does automatically loads ~/.Xresources on logging in, but with the -nocpp switch, so that you cannot use #define statements in your .Xresources. This is a confirmed bug upstream[1] and I have sent a patch there as well[2]. The arch package however comes with a custom version of the /etc/lightdm/Xsession script, so it has to be modified here as well. This means in particular, that the -nocpp switch should be removed from line 19 of the arch-specific Xsession script[3].

[1] https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1244578
[2] http://bazaar.launchpad.net/~cqql/lightdm/cpp/revision/2140
[3] https://projects.archlinux.org/svntogit/community.git/tree/trunk/Xsession?h=packages/lightdm#n19

Steps to reproduce:
Install lightdm and have a ~/.Xresources, that uses #defines.