[PATCH 8/8] makefile: avoid non-POSIX which(1)

[Eric Wong <e@80x24.org>]

which(1) isn't in POSIX so it's perhaps less likely to be
available (although I don't think I've noticed a system
without it in decades).  So replace it with the POSIX
`command -v', even though everyone seems to use which...

Add a note about `lexgrog', too, since I'm not sure if it's
packaged for various *BSDs.
---
 Documentation/include.mk | 2 ++
 Makefile.PL              | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/include.mk b/Documentation/include.mk
index eb65454a..86851376 100644
--- a/Documentation/include.mk
+++ b/Documentation/include.mk
@@ -6,6 +6,8 @@ RSYNC = rsync
 RSYNC_DEST = public-inbox.org:/srv/public-inbox/
 AWK = awk
 MAN = man
+
+# part of `man-db' on Debian, not sure about other distros
 LEXGROG = lexgrog
 
 # this is "xml" on FreeBSD and maybe some other distros:
diff --git a/Makefile.PL b/Makefile.PL
index 81992e46..8bd39e6c 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -126,7 +126,7 @@ my %man3 = map {; # semi-colon tells Perl this is a BLOCK (and not EXPR)
 	"lib/PublicInbox/$_" => "blib/man3/PublicInbox::$mod.\$(MAN3EXT)"
 } qw(Git.pm Import.pm WWW.pod SaPlugin/ListMirror.pod);
 my $warn_no_pod = @no_pod ? "\n\t\@echo W: missing .pod: @no_pod\n" : '';
-chomp(my $lexgrog = `which lexgrog 2>/dev/null`);
+chomp(my $lexgrog = `command -v lexgrog 2>/dev/null`);
 my $check_lexgrog = $lexgrog ? 'check-lexgrog' : '';
 
 WriteMakefile(