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bug#29931: 27.0.50; Slightly suboptimal build behavior on macOS

From: Philipp Stephani
Subject: bug#29931: 27.0.50; Slightly suboptimal build behavior on macOS
Date: Mon, 01 Jan 2018 15:05:02 +0000

Alan Third <address@hidden> schrieb am Mo., 1. Jan. 2018 um 15:59 Uhr:
On Mon, Jan 01, 2018 at 01:15:09PM +0100, Philipp wrote:
> There are a few small bugs when building on macOS and not passing the
> right configure options.
> 1. When running configure without options, the build fails with an error
> xml.c:26:10: fatal error: 'libxml/tree.h' file not found
> #include <libxml/tree.h>
>          ^~~~~~~~~~~~~~~
> Apparently configure detects libxml2 to be present, but doesn't set the
> correct include path.

This works fine here. Is it possible this was introduced by macOS

Do you see the file in /usr/include/libxml2/libxml/?

No, /usr/include doesn't exist at all on my system. The include directory is /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include.

> 2. When building with --without-libxml2, the build succeeds, but gives
> warnings like
>   GEN      ../../info/auth.info
> ./../emacs/docstyle.texi:3: warning: unrecognized encoding name `UTF-8'.
> This is because macOS ships an ancient version of makeinfo (4.8).  It's
> possible to install a newer version using Homebrew, but that's not in
> PATH and therefore not found.  Maybe configure could also search for
> makeinfo in the Homebrew directory (/usr/local/opt/texinfo/bin)?

I’d think it’s the user’s responsibility to make sure /usr/local/bin
is on their path if they want to use homebrew stuff?

/usr/local/bin doesn't contain makeinfo when installed via Homebrew. This is intentional; `brew info texinfo` says

==> Caveats

This formula is keg-only, which means it was not symlinked into /usr/local,

because software that uses TeX, such as lilypond and octave, require a newer

version of these files.

If you need to have this software first in your PATH run:

  echo 'export PATH="/usr/local/opt/texinfo/bin:$PATH"' >> ~/.bash_profile

I can obviously do that or set MAKEINFO explicitly when invoking configure, but it would be nice if configure detected this situation automatically. 

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