I want to tell make that it shall always use -j4 option even if I didn\'t specify it vie command line. Normally i would do this in some configuration file (i.e.
Well, yes and no --- normally you would use an include file. Put your common configuration items together in a file, say common.mk and add
include common.mk
at the top of your makefile. If the flag doesn't have a matching way to configure it from inside the make file, you can use a function
function mk {
make -j4 $*
}