Fixed the -threads test to only work if -threads works, added /usr/openwin/include, /usr/dt/include and /usr/X11/include to the list of places to hunt for X11 include files
Fixed the -threads test to only work if -threads works, added
/usr/openwin/include, /usr/dt/include and /usr/X11/include to the list of
places to hunt for X11 include files

tphelps/xtickertape,tphelps/xtickertape,tphelps/xtickertape,epronk/xtickertape,epronk/xtickertape