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From: Juergen Keil <jk@tools.de>
Subject: Re: [Qemu-devel] [PATCH] configure
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> Thiemo Seufer wrote:
> Jeff Chua wrote:
> [snip]
> > @@ -567,7 +567,8 @@
> >    fi
> > 
> >    # Check if tools are available to build documentation.
> > -if [ -x "`which texi2html`" ] && [ -x "`which pod2man`" ]; then
> > +if [ -x "`which texi2html 2>/dev/null`" \
> > +	-a -x "`which pod2man 2>/dev/null`" ]; then
> 
> Under which circumstances does "which" complain about unavailable
> executables?

 
Isn't the use of "which" wrong, anyway?  

"which" belongs to csh/tcsh, and tells you about csh's/tcsh's idea 
about a command or a csh command alias.

IMO, for a /bin/sh (or bash) script, using the "type" command would
be a better idea.