Need to add back, but conditionally, ${X_LIBS} -lX11. Can't use HAVE_X
because OSX 10.5 has X but adding extra -lX11 options causes problems. Use HAVE_V4L in hopes that only linux systems will be affected.
Authored by: sms00 2007-11-07
Parent: [r3200]
Child: [r3202]
