Tried building libbonobomm against gtkmm for gtk 2.4 but once I modified
configure to look for gtkmm-2.4.pc I get the below error.

make[1]: Entering directory `/usr/src/libbonobomm-1.3.8'
Making all in tools
make[2]: Entering directory `/usr/src/libbonobomm-1.3.8/tools'
Making all in extra_defs_gen
make[3]: Entering directory `/usr/src/libbonobomm-1.3.8/tools/extra_defs_gen'
source='generate_defs_libbonobo.cc' object='generate_defs_libbonobo.o' libtool=no \
depfile='.deps/generate_defs_libbonobo.Po'
tmpdepfile='.deps/generate_defs_libbonobo.TPo' \
depmode=gcc3 /bin/sh ../../scripts/depcomp \
g++ -DHAVE_CONFIG_H -I. -I. -I../../bonobomm -DORBIT2=1 -I/usr/include/gtkmm-2.3
-I/usr/lib/gtkmm-2.3/include -I/usr/include/glibmm-2.3
-I/usr/lib/glibmm-2.3/include -I/usr/include/gdkmm-2.3
-I/usr/lib/gdkmm-2.3/include -I/usr/include/pangomm-1.3 -I/usr/include/atkmm-1.3
-I/usr/include/gtk-2.0 -I/usr/include/sigc++-2.0 -I/usr/include/glib-2.0
-I/usr/lib/glib-2.0/include -I/usr/lib/gtk-2.0/include -I/usr/include/pango-1.0
-I/usr/X11R6/include -I/usr/include/freetype2 -I/usr/include/atk-1.0
-I/usr/include/libbonobo-2.0 -I/usr/include/orbit-2.0
-I/usr/include/bonobo-activation-2.0 -I/usr/include/orbitcpp-2.0      -O
-march=athlon-mp -mmmx -mfpmath=sse -msse -m3dnow -pipe -O3 -c -o
generate_defs_libbonobo.o `test -f 'generate_defs_libbonobo.cc' || echo
'./'`generate_defs_libbonobo.cc
generate_defs_libbonobo.cc:22:59:
gtkmm_generate_extra_defs/generate_extra_defs.h: No such file or directory
generate_defs_libbonobo.cc: In function `int main(int, char**)':
generate_defs_libbonobo.cc:34: error: `cout' undeclared in namespace `std'
generate_defs_libbonobo.cc:34: error: `get_defs' undeclared (first use this
   function)
generate_defs_libbonobo.cc:34: error: (Each undeclared identifier is reported
   only once for each function it appears in.)
make[3]: *** [generate_defs_libbonobo.o] Error 1
make[3]: Leaving directory `/usr/src/libbonobomm-1.3.8/tools/extra_defs_gen'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/src/libbonobomm-1.3.8/tools'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/src/libbonobomm-1.3.8'