Libguestfs - Jun 2012 - [hivex] OS X: Augment pkg-config search path

Hello all,

I found OS X still has one remaining issue in the autotools.  OS X does not
include pkg-config by default, and whatever mechanism installs it places pkg.m4
in some location among:

/opt/local/share/aclocal/pkg.m4
/usr/local/share/aclocal/pkg.m4

PKG_CHECK_MODULES isn't defined if pkg.m4 isn't in /usr/share/aclocal,
so ./configure dies without augmenting aclocal's search path.

My question:  What is the proper way to augment this path?  I see two options
available, one at the top of hivex/Makefile.am:
ACLOCAL_AMFLAGS = -I m4 -I /opt/local/share/aclocal

And one at the bottom of hivex/bootstrap:
AUTOPOINT=true LIBTOOLIZE=true autoreconf --verbose -I /opt/local/share/aclocal
--install

I just hard-coded one path into those example lines, as I'm simply not sure
what the PATH variable I should use is.  aclocal dies if a non-existent path
component is passed with -I.  If I understand correctly, PKG_CONFIG_PATH
doesn't appear to be used for finding the base pkg-config macros.

I can somewhat find the path in bootstrap with this clunky line:
pkgm4dir=$(test -f /opt/local/share/aclocal/pkg.m4 && dirname
/opt/local/share/aclocal/pkg.m4)||$(test -f /usr/local/share/aclocal/pkg.m4
&& dirname /usr/local/share/aclocal/pkg.m4)||$(test -f
/usr/share/aclocal/pkg.m4 && dirname /usr/share/aclocal/pkg.m4)

But I suspect there's a better way.  Can someone help with what this would
be?

--Alex

On Fri, Jun 08, 2012 at 03:20:28PM -0700, Alex Nelson
wrote:
> Hello all,
> 
> I found OS X still has one remaining issue in the autotools.  OS X does not
include pkg-config by default, and whatever mechanism installs it places pkg.m4
in some location among:
> 
> /opt/local/share/aclocal/pkg.m4
> /usr/local/share/aclocal/pkg.m4
> 
> PKG_CHECK_MODULES isn't defined if pkg.m4 isn't in
/usr/share/aclocal, so ./configure dies without augmenting aclocal's search
path.
> 
> My question:  What is the proper way to augment this path?  I see two
options available, one at the top of hivex/Makefile.am:
> ACLOCAL_AMFLAGS = -I m4 -I /opt/local/share/aclocal
If that works, then how about either:

  aclocal -I /opt/local/share/aclocal

or:

  make ACLOCAL_AMFLAGS="-I /opt/local/share/aclocal"
> And one at the bottom of hivex/bootstrap:
> AUTOPOINT=true LIBTOOLIZE=true autoreconf --verbose -I
/opt/local/share/aclocal --install
> 
> I just hard-coded one path into those example lines, as I'm simply not
sure what the PATH variable I should use is.  aclocal dies if a non-existent
path component is passed with -I.  If I understand correctly, PKG_CONFIG_PATH
doesn't appear to be used for finding the base pkg-config macros.
> 
> I can somewhat find the path in bootstrap with this clunky line:
> pkgm4dir=$(test -f /opt/local/share/aclocal/pkg.m4 && dirname
/opt/local/share/aclocal/pkg.m4)||$(test -f /usr/local/share/aclocal/pkg.m4
&& dirname /usr/local/share/aclocal/pkg.m4)||$(test -f
/usr/share/aclocal/pkg.m4 && dirname /usr/share/aclocal/pkg.m4)
> 
> But I suspect there's a better way.  Can someone help with what this
would be?
Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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