5.4 Using X11

Table 5-2. Variables for ports that use X

USE_X_PREFIX	The port installs in X11BASE, not PREFIX.
USE_XLIB	The port uses the X libraries.
USE_MOTIF	The port uses the Motif toolkit. Implies USE_XPM.
USE_IMAKE	The port uses imake. Implies USE_X_PREFIX.
XMKMF	Set to the path of xmkmf if not in the PATH. Defaults to xmkmf -a.