bumblebee-git: make virtualgl optional

primus works as good, do not hard-depend on virtualgl.

bumblebee-git/PKGBUILD

@@ -7,16 +7,17 @@ pkgname=bumblebee-git
 _gitname=bumblebee
 pkgver=3.2.1.r14.b506a03
 pkgrel=1
-pkgdesc="Develop branch of Bumblebee. Optimus Support for Linux Through VirtualGL. You need to install proper drivers separately. Can be used with Nouveau or Nvidia"
+pkgdesc="NVIDIA Optimus support for Linux through VirtualGL or primus"
 arch=('i686' 'x86_64')
-depends=('virtualgl' 'glib2' 'mesa-libgl')
+depends=('glib2' 'mesa-libgl')
 makedepends=('git' 'help2man')
 optdepends=('bbswitch: switch on/off discrete card'
             'xf86-video-nouveau: Nouveau driver'
             'nouveau-dri: 3D acceleration features fo Nouveau'
             'nvidia: NVIDIA kernel driver'
             'nvidia-340xx: NVIDIA kernel driver for older devices'
             'nvidia-304xx: NVIDIA kernel driver for even older devices'
+            'virtualgl: oldest back-end for optirun'
             'primus: faster back-end for optirun')
 if [ "$CARCH" = "x86_64" ]; then
      optdepends[${#optdepends[@]}]='lib32-virtualgl: run 32bit applications with optirun'

bumblebee-git/bumblebee.install

@@ -1,4 +1,5 @@
 _notice() {
+    echo "For optirun to work, you need to install at least virtualgl or primus"
     echo "Don't forget to add yourself to the 'bumblebee' group to use Bumblebee"
 }