Allow overriding of a2x in the environment; as it may also be installed as a2x.py

[i3/i3status] / man / Makefile

all: i3status.1

A2X?=a2x

i3status.1: asciidoc.conf i3status.man
        ${A2X} -f manpage --asciidoc-opts="-f asciidoc.conf" i3status.man
clean:
        rm -f i3status.xml i3status.1 i3status.html