Re: Missing test for optional libraries?

[Lars Clausen]

On Wed, 6 Mar 2002, Paul Eggert wrote:
>> From: Lars Clausen <address@hidden>
>> Date: 06 Mar 2002 13:07:48 -0600
>> 
>> Earlier we used hand-built macros to check for Freetype, but since
>> we have to check the version, we now use the AC_CHECK_FT2 macro.
> 
> AC_CHECK_FT2 is not part of Autoconf, so possibly this is a problem
> with your definition of this macro, not with Autoconf itself.

I know it isn't, the problem is when freetype isn't installed, I still need
to be able to run the configure script.

>> ./configure: line 6267: syntax error near unexpected token
>> `AC_CHECK_FT2(2.0.5,' ./configure: line 6267: ` AC_CHECK_FT2(2.0.5,'
> 
> This looks like the macro AC_CHECK_FT2 was not defined.  It needs to
> be defined to valid shell commands, even if those commands are not
> executed; otherwise the shell script won't parse.

That's what I'm trying, but how can I define it to an empty macro only when
it isn't already defined?  I've been trying to use the m4 ifdef to do this,
but it seems the AC_DEFUN is still run when AC_CHECK_FT2 is defined prior
to this.  Here's the best I could come up with.  Any better ideas?

ifdef(AC_CHECK_FT2,,AC_DEFUN(AC_CHECK_FT2,))

-Lars

-- 
Lars Clausen (http://shasta.cs.uiuc.edu/~lrclause)| Hårdgrim of Numenor
"I do not agree with a word that you say, but I   |----------------------------
will defend to the death your right to say it."   | Where are we going, and
    --Evelyn Beatrice Hall paraphrasing Voltaire  | what's with the handbasket?