> KNL_VER := $(shell uname -r) > KNL_MAJOR := $(shell echo $(KNL_VER) | cut -c -3) > > all: > $(SHELL) if [2.4 == $(KNL_MAJOR)]; then \ > $(MAKE) -C AppDir -f makefile \ > else \ > $(MAKE) -C AppDir -f Makefile \ > fi > But it doesn't work, I don't know how to do it. what you need to know, is that each line is a shell command. the reason for the continuaiton character is because an "if" on its own is a syntax error, so your 5 line if is run as a "single" command. This also means that you need a ";" at the end of each command within the if/else. hence, you don't need $(SHELL) prior to the if. also, you need spaces after the "[" and before the "]". you'll need to adjust the spaces to tabs as appropriate, but the following should work: KNL_VER:= $(shell uname -r) KNL_MAJOR:= $(shell echo $(KNL_VER) | cut -c -3) all: if [ 2.4 == $(KNL_MAJOR) ]; then \ $(MAKE) -C AppDir -f makefile; \ else \ $(MAKE) -C AppDir -f Makefile; \ fi > I found some project use something like this in makefile > > all: > -@if [ ! -f .config ]; then \ > cp a.file b.file \ > fi the '@' just means don't echo the command that is about to be run
