For those interested, I successfully build for linux the tot object from mixed/toxy, which is no longer supported in pd-extended 0.43. I love this external which gets keyboard and mouse interactions per window, with relative mouse coordinates.

First, get the svn branch of pd-extended (containing most of the externals, unlike the git branch):
svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk pd-svn

Then go to pd-svn/externals/miXed:
cd pd-svn/externals/miXed

and build the miXed lib:
make

After a while, you will find the resulting binaries, including tot, in pd-svn/externals/miXed/bin. Help files are in pd-svn/externals/miXed/doc/help. Time to move to 0.43