turning on X extensions with XFree86 4.0.x

[Joshua N Pritikin <vishnu@pobox.com>]

i installed xserver-xfree86_4.0.3-4_i386.deb today, and simple things like
the shaped window extension disappeared.  xdpyinfo reports:

number of extensions:    8
    LBX
    MIT-SHM
    SECURITY
    XC-APPGROUP
    XFree86-Bigfont
    XInputExtension
    XKEYBOARD
    XTEST

However, i see a bunch of other goodies here:

/usr/X11R6/lib/modules/extensions/libGLcore.a
/usr/X11R6/lib/modules/extensions/libdbe.a
/usr/X11R6/lib/modules/extensions/libdri.a
/usr/X11R6/lib/modules/extensions/libextmod.a
/usr/X11R6/lib/modules/extensions/libglx.a
/usr/X11R6/lib/modules/extensions/libpex5.a
/usr/X11R6/lib/modules/extensions/librecord.a
/usr/X11R6/lib/modules/extensions/libxie.a

The man pages are not helpful;  i'd prefer not to download the source code
to research this.  Is there some magic way to turn on these extensions?

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