The latest gconfmm tarball (2.28.2) fails to build with documentation:

/bin/mkdir -p '/usr/src/packages/BUILDROOT/gconfmm-2.28.2-13.2.i386/usr/share/doc/gconfmm-2.6/reference/html'
/usr/bin/perl -- "/usr/share/glibmm-2.4/doctool/doc-install.pl" --verbose --mode=0644 -l 'libsigc++-2.0.tag@../../../libsigc++-2.0/reference/html/' -l 'glibmm-2.4.tag@../../../glibmm-2.4/reference/html/' -l 'cairomm-1.0.tag@../../../cairomm-1.0/reference/html/' -t '/usr/src/packages/BUILDROOT/gconfmm-2.28.2-13.2.i386/usr/share/doc/gconfmm-2.6/reference/html' --glob -- 'reference/html/*.css' 'reference/html/*.gif' 'reference/html/*.html' 'reference/html/*.png'
Can't open perl script "/usr/share/glibmm-2.4/doctool/doc-install.pl": No such file or directory
make[2]: *** [install-htmlref] Error 2
make[2]: Leaving directory `/usr/src/packages/BUILD/gconfmm-2.28.2/docs'
make[1]: *** [install-am] Error 2
make[1]: Leaving directory `/usr/src/packages/BUILD/gconfmm-2.28.2/docs'
make: *** [install-recursive] Error 1

I guess that's because of the mm-common work that has been happening lately. I'm not quite sure if a fix involves moving gconfmm to mm-common or just releasing a new tarball built against latest versions of everything.

Note: I think I've seen the same issue with gtkmm (2.x branch) and gtksourceviewmm (2.x branch). I'll file bugs later for those, as I'd like to first understand things.