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.