gdm uses /usr/bin/X on systems with /usr/local/bin/X
Submitted by Allison (desrt)
Link to original bug (#725762)
Description
gdm has an impressively exhaustive list of possible X server locations in configure.ac but it misses /usr/local/bin/X
this results in the fallback of /usr/bin/X being used.
AC_PATH_PROG might help a bit here.