[PATCH] manual: skip build when perl is unavailable

[Mike Frysinger]

On 21 Aug 2015 17:20, Joseph Myers wrote:
> On Fri, 21 Aug 2015, Mike Frysinger wrote:
> > Do not try to generate the manual when perl is unavailable.  This
> > matches the behavior when makeinfo is unavailable.  Otherwise the
> > install step fails when trying to generate the libm section since
> > it runs a perl script.
> 
> OK with a comment on the ifneq saying "libm-err.texi generation requires 
> perl" or similar.

donesky
-mike
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