To help you a bit more... Note that debian/rules will write an 'ignore' line in the .build file. Considering your package has a long time building process, to test, you can manually write a similar line in .build and test using 'blhc --all --debian <file>.build', before changing the debian/rules. See below an example about what write in .build file (see the middle line):
Makefile:894: warning: ignoring prerequisites on suffix rule definition blhc: ignore-line-regexp: eval\ \./ff-c\+\+\ .*\.cpp.* eval ./ff-c++ tetgen.cpp -ltet Cheers, Eriberto
