How portable are the shell expansions that GNU Make uses, to other implementations of make? I'm referring to these constructs: CURRENT_DIR=$(shell pwd) CURRENT_DIR2=`pwd` Both forms seem to work fine with GNU make. Are they GNU-specific extensions, though? Thanks, John -- dusk@ravendusk.org http://www.gnome.org jsheets@codeweavers.com http://www.worldforge.org