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AX_WARNING_DEFAULT_PKGCONFIGDIR [(dirvariable [,[defsetting][,[A][,[N/A]]]])]
AX_ENABLE_DEFAULT_PKGCONFIGDIR [(dirvariable [,defsetting])]


print a warning message if the $(datadir)/aclocal directory is not in the dirlist searched by the aclocal tool. This macro is useful if some ‘make install‘ would target $(datadir)/aclocal to install an autoconf m4 file of your project to be picked up by other projects.

 default $1 dirvariable = pkgconfigdir
 default $2 defsetting  = ${libdir}/pkgconfig
 default $3 action = nothing to do
 default $4 action = warn the user about mismatch

In the _WARNING_ variant, the defsetting is not placed in dirvariable nor is it ac_subst’ed in any way. The default fail-action $4 is to send a warning message to the user, and the default accept-action $3 is nothing. It is expected that a Makefile is generated with pkgconfigdir=${libdir}/pkgconfig

The _ENABLE_ variant however will set not only the $pkgconfigdir shell var of the script, but it is also AC-SUBST’ed on default - and furthermore a configure option "–enable-default-pkgconfigdir" is provided. Only if that option is set then $2 default is not set to the canonic default in the a $prefix subpath but instead $2 default is set to the primary path where ‘pkg-config‘ looks for .pc files. The user may also override the default on the command line.

Source Code

Download the latest version of ax_warning_default_pkgconfig.m4 or browse the macro’s revision history.


Copyright © 2008 Guido U. Draheim

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <>.

As a special exception, the respective Autoconf Macro’s copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts, even though portions of the text of the Macro appear in them. The GNU General Public License (GPL) does govern all other use of the material that constitutes the Autoconf Macro.

This special exception to the GPL applies to versions of the Autoconf Macro released by the Autoconf Archive. When you make and distribute a modified version of the Autoconf Macro, you may extend this special exception to the GPL to apply to your modified version as well.

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