ifeq ($(shell dpkg -l libnetfilter-queue-dev),)
$(info "nfblocker requires the libnetfilter-queue-dev package")
$(info "please install it before making")
ifeq ($(shell dpkg -l libnetfilter-queue-dev),)
$(info "nfblocker requires the libnetfilter-queue-dev package")
$(info "please install it before making")