Use `test -f` instead of `cp -n`, because the former is POSIX.
References: https://github.com/emersion/soju/pull/32
git-svn-id: file:///srv/svn/repo/suika/trunk@613 f0ae65fe-ee39-954e-97ec-027ff2717ef4
Otherwise soju would be rebuilt as the user who runs "make install"
(typically root).
git-svn-id: file:///srv/svn/repo/suika/trunk@530 f0ae65fe-ee39-954e-97ec-027ff2717ef4
Otherwise running `make` didn't do anything on a non-clean state. Go
deals with changed files automatically, and there's no real need to
explicitly specify them.
git-svn-id: file:///srv/svn/repo/suika/trunk@510 f0ae65fe-ee39-954e-97ec-027ff2717ef4
