Thanks, with this I got it compiled.
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fennec with gstreamer (not handy deb-version, but can be compiled)
* Installed newer libglib-dev.deb (http://talk.maemo.org/showpost.php?p...9&postcount=28 )

*gstreamer-0.10.33 from upstream
configure; make ; make install
(there might be bug in gstmessage.h:264: "error: comma at end of enumerator list")

*gst-plugins-base-0.10.33 from upstream
configure; make ; make install
(there might be linking-bug in test/examples/Makefile: drop 'encoding' from SUBDIRS and DIST_SUBDIRS)

*--enable-gstreamer to mozconfig,
-> compiles (didn't yet run it, needs libraries to the device also)