John Graham-Cumming, who’s just written the GNU Make Book (Amazon): It’s: print-%: ; @echo $*=$($*) It allows you to quickly get the value of any makefile variable. For example, suppose you want to know the value of a variable called SOURCE_FILES. You’d just type: make print-SOURCE_FILES This works with the 2006 version of GNU Make … Continue reading The One Line You Should Add to Every Makefile