Set $(VPR_BASE_DIR) conditionally instead of using $(basedir).  This allows $(VPR_BASE_DIR) to havea default (helpful in the developer installation) that can be overridden with an environment variable (helpful for the real installation and the developer who hse more build directories than s/he knows what to do with).
Set $(VPR_BASE_DIR) conditionally instead of using $(basedir).  This allows
$(VPR_BASE_DIR) to havea default (helpful in the developer installation)
that can be overridden with an environment variable (helpful for the real
installation and the developer who hse more build directories than s/he
knows what to do with).


git-svn-id: 769d22dfa2d22aad706b9a451492fb87c0735f19@5575 08b38cba-cd3b-11de-854e-f91c5b6e4272

godbyk/vrjuggler-upstream-old,MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,vancegroup-mirrors/vrjuggler,vrjuggler/vrjuggler,MichaelMcDonnell/vrjuggler,vrjuggler/vrjuggler,LiuKeHua/vrjuggler,LiuKeHua/vrjuggler,MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,MichaelMcDonnell/vrjuggler,MichaelMcDonnell/vrjuggler,vrjuggler/vrjuggler,godbyk/vrjuggler-upstream-old,LiuKeHua/vrjuggler,vancegroup-mirrors/vrjuggler,vrjuggler/vrjuggler,godbyk/vrjuggler-upstream-old,MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,vrjuggler/vrjuggler,godbyk/vrjuggler-upstream-old,vancegroup-mirrors/vrjuggler,vancegroup-mirrors/vrjuggler,vancegroup-mirrors/vrjuggler,MichaelMcDonnell/vrjuggler,vancegroup-mirrors/vrjuggler,godbyk/vrjuggler-upstream-old,LiuKeHua/vrjuggler,vrjuggler/vrjuggler,vrjuggler/vrjuggler,godbyk/vrjuggler-upstream-old,MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,vrjuggler/vrjuggler