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sudo != [ $$(id -u) = 0 ] || groups | grep -wo sudo
screen != command -v screen
apt = $(sudo) apt
install = $(sudo) install
ifeq (,$(screen))
prereqs += screen
endif
.PHONY: install deps
install: deps
$(install) -v -T -- src/twopane.bash /usr/local/bin/twopane
deps: apt-install.stamp
apt-install.stamp: Makefile
ifneq (,$(prereqs))
$(apt) install --no-upgrade $(prereqs)
endif
touch $@
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