make fails if do not have help2man

[Kiyoshi KANAZAWA]

Hello,


make fails as
  AR       lib/liby.a
  GEN      src/yacc
  GEN      doc/bison.1
/tmp/bison-3.0.2/build-aux/missing: line 81: help2man: command not found
WARNING: 'help2man' is missing on your system.
         You should only need it if you modified a dependency of a man page.
         You may want to install the GNU Help2man package:
         <http://www.gnu.org/software/help2man/>
Makefile:5264: recipe for target 'doc/bison.1' failed
make[2]: *** [doc/bison.1] Error 127
make[2]: Leaving directory '/tmp/bison-3.0.2'
Makefile:4493: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/tmp/bison-3.0.2'
Makefile:2593: recipe for target 'all' failed
make: *** [all] Error 2


The message says "You should only need it if you modified a dependency of a man 
page."
On the other hand, make fails with Error.

If help2man is required, I will install it.
Or, this has to be passed when help2man is not found.


Conditions of host:
Solaris 10 x86
(self-compiling, not cross-compiling)

bison-3.0.2 with
[PATCH 1/2] package: install README and the like in docdir
[PATCH 2/2] package: install the examples
[PATCH] build: don't try to generate docs when cross-compiling


Regards,

--- Kiyoshi <address@hidden>