On Debian Etch systems it is impossible to install out of the box both libglade-gnome0-dev and libsvn-dev due to a conflict between depended upon libraries.
In order to install them side by side you will have to modify an existing libdb4.4-dev deb package to add "libdb3-dev" to the Provides: field of the package. You can do this by editing DEBIAN/control after running:
deb-reversion -k /bin/sh libdb4.4-dev_*.deb
When done, exit and install the newly created libdb4.4-dev package:
dpkg -i libdb4.4-dev*LOCAL*.deb
I managed to find this solution thanks to mrvn and other people on IRC. Thanks.