Commit 0055c6a introduced a new preConfigure hook that sets the right
qmake path. Unfortunately the mkDerivation attributes of
libqtelegram-aseman-edition override the whole configurePhase, so this
hook isn't run at all.
This fixes the build of libqtelegram-aseman-edition and it now
successfully compiles on my machine.
Built it using the following command, because it wasn't exposed via the
top-level packages attribute:
nix-build -E '
with import ./. {};
qt55.callPackage pkgs/applications/networking/instant-messengers/telegram/libqtelegram-aseman-edition {}
'
Signed-off-by: aszlig <aszlig@redmoonstudios.org>