You don't see it? Where exactly? What does this command give you:
And if you run Allwmake once again, it should give you a summary of the things that are already built and where they are placed.

That executable wasn't installed in the standard /Openfoam/ path but in my $HOME directory. What a strange, little Allwmake. I would figure it would be somewhere in the /swak/ or /Openfoam/ path, but nope. Well, lets see if this executable works!
Thanks again Bruno!

swak puts the binaries in $FOAM_USER_APPBIN and $FOAM_USER_LIBBIN but for the compiling user it shouldn't matter as these are in his path.

Stuff that doesn't come with the OF-distro should (in my opinion) NEVER go into FOAM_APPBIN and FOAM_LIBBIN. If you really want to make the stuff available to others copy it to FOAM_SITE_LIBBIN and FOAM_SITE_APPBIN. Actually there comes a script with swak that does that. But be warned: users that compile their own swak-version might experience problems due to a mixing of libraries. That's why I usually don't recommend it (the problems are rare but hard to diagnose)