This is a semi-automatic report based on the latest archive rebuild results [1].
Apologies if it reaches you in error.
Excerpt from the buildlog:
configure: creating ./config.status
config.status: creating Makefile
configure: WARNING: unrecognized options: --disable-maintainer-mode, --disable-dependency-tracking
dh_auto_build
make[1]: Entering directory `/build/buildd/pidgin-twitter-0.9.2.1'
cc -MM main.c util.c prefs.c icon.c twitter_api.c > .deps
make[1]: Leaving directory `/build/buildd/pidgin-twitter-0.9.2.1'
make[1]: Entering directory `/build/buildd/pidgin-twitter-0.9.2.1'
cc -o main.o main.c -c -fPIC -shared -Wall -Werror -g -pthread -I/usr/include/gtk-2.0 -I/usr/lib/i386-linux-gnu/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/pidgin -I/usr/include/libpurple -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/libxml2 -DDATADIR=\"/usr/share\"
cc -o util.o util.c -c -fPIC -shared -Wall -Werror -g -pthread -I/usr/include/gtk-2.0 -I/usr/lib/i386-linux-gnu/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/pidgin -I/usr/include/libpurple -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/libxml2 -DDATADIR=\"/usr/share\"
cc -o prefs.o prefs.c -c -fPIC -shared -Wall -Werror -g -pthread -I/usr/include/gtk-2.0 -I/usr/lib/i386-linux-gnu/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/pidgin -I/usr/include/libpurple -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/libxml2 -DDATADIR=\"/usr/share\"
cc -o icon.o icon.c -c -fPIC -shared -Wall -Werror -g -pthread -I/usr/include/gtk-2.0 -I/usr/lib/i386-linux-gnu/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/pidgin -I/usr/include/libpurple -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/libxml2 -DDATADIR=\"/usr/share\"
icon.c: In function 'got_page_cb':
icon.c:283:9: error: 'gdk_pixbuf_unref' is deprecated (declared at /usr/include/gdk-pixbuf-2.0/gdk-pixbuf/gdk-pixbuf-core.h:243): Use 'g_object_unref' instead [-Werror=deprecated-declarations]
icon.c: In function 'make_scaled_pixbuf':
icon.c:330:5: error: 'gdk_pixbuf_unref' is deprecated (declared at /usr/include/gdk-pixbuf-2.0/gdk-pixbuf/gdk-pixbuf-core.h:243): Use 'g_object_unref' instead [-Werror=deprecated-declarations]
cc1: all warnings being treated as errors
make[1]: *** [icon.o] Error 1
make[1]: Leaving directory `/build/buildd/pidgin-twitter-0.9.2.1'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20120209-1347
FAILED [dpkg-buildpackage died]
The full buidlog can be found at https://launchpad.net/ubuntu/+archive/test-rebuild-20120201/+build/3166302/+files/buildlog_ubuntu-precise-i386.pidgin-twitter_0.9.2.1-1_FAILEDTOBUILD.txt.gz.
[1] http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20120201-precise.html
This bug was fixed in the package pidgin-twitter - 0.9.2.1-1ubuntu1
---------------
pidgin-twitter (0.9.2.1-1ubuntu1) precise; urgency=low
* Fix FTBFS with gdk-pixbuf 2.25. (LP: #935366) gdkpixbuf_ 225.diff to use g_object_unref() instead of
- Add fix_ftbfs_
the deprecated gdk_pixbuf_unref()
-- Felix Geyer <email address hidden> Thu, 01 Mar 2012 19:52:01 +0100