Building on Xubuntu fails with:
./bigforth -e ": :linux ; include forth.fb save-target forthker-linux cr bye"
Could not open image file /usr/local/lib/bigforth/./bigforth.fi
Makefile:109: recipe for target 'forthker-linux.fi' failed
make: *** [forthker-linux.fi] Error 255
Building on Xubuntu fails with: