Qt/X11 only:
* -no-nas-sound ...... Do not compile in NAS sound support.
-system-nas-sound .. Use NAS libaudio from the operating system.
See http://radscan.com/nas.html
$SMN -no-sm ............. Do not support X Session Management.
$SMY -sm ................ Support X Session Management, links in -lSM -lICE.
$SHN -no-xshape ......... Do not compile XShape support.
$SHY -xshape ............ Compile XShape support.
Requires X11/extensions/shape.h.
$XRN -no-xinerama ....... Do not compile Xinerama (multihead) support.
$XRY -xinerama .......... Compile Xinerama support.
Requires X11/extensions/Xinerama.h and libXinerama.
$XCN -no-xcursor ........ Do not compile Xcursor support.
$XCY -xcursor ........... Compile Xcursor support.
Requires X11/Xcursor/Xcursor.h and libXcursor.
$XZN -no-xrandr ......... Do not compile XRandR (resize and rotate) support.
$XZY -xrandr ............ Compile XRandR support.
Requires X11/extensions/Xrandr.h and libXrandr.
$XRN -no-xrender ........ Do not compile XRender support.
$XRY -xrender ........... Compile XRender support.
Requires Xft support (see -xft below),
X11/extensions/Xrender.h and libXrender
$XFTN -no-xft ............ Do not compile Xft (anti-aliased font) support.
$XFTY -xft ............... Compile Xft support.
Requires X11/Xft/XftFreetype.h and libXft.
$XIN -no-tablet ......... Do not compile Tablet support.
$XIY -tablet ............ Compile Tablet support.
Requires IRIX with wacom.h and libXi or
XFree86 with X11/extensions/XInput.h and libXi.
$XKN -no-xkb ............ Do not compile XKB (X KeyBoard extension) support.
$XKY -xkb ............... Compile XKB support.