make Makefile GNU make v3.82 compatible

[larskotthoff]

Quote from NEWS file:

In previous versions of make it was acceptable to list one or more explicit
targets followed by one or more pattern targets in the same rule and it
worked "as expected". However, this was not documented as acceptable and if
you listed any explicit targets AFTER the pattern targets, the entire rule
would be mis-parsed. This release removes this ability completely: make
will generate an error message if you mix explicit and pattern targets in
the same rule.

[mbostock]

Is there a way to do this without duplicating the rule definition?

[larskotthoff]

Well.

d3%js: Makefile
@rm -f $@
cat $(filter %js,$^) > $@
@chmod a-w $@

This works as well. Maybe a bit hacky without the dots?

[mbostock]

Yeah. That's better. A small tweak:

d3.%: Makefile
    @rm -f $@
    cat $(filter %.js,$^) > $@
    @chmod a-w $@

I'm also tempted to add:

JS_FILES = \
    d3.js \
    d3.chart.js \
    d3.layout.js \
    d3.csv.js \
    d3.geo.js \
    d3.geom.js \
    d3.time.js

all: \
  $(JS_FILES) \
  $(JS_FILES:.js=.min.js) \
  package.json