CVS build fails on Ubuntu 14.04 i386

[flapane <int...@gm...>]

My bad, I totally forgot the reference to the original thread: 
http://sourceforge.net/p/gnuplot/mailman/message/32467740/

/usr/bin/ld: wxterminal/wxt_gui.o: undefined reference to symbol
'XInitThreads'
//usr/lib/i386-linux-gnu/libX11.so.6: error adding symbols: DSO missing
from command line