Add instructions on running autoreconf with pkg-config

pablogsal · pablogsal · commit ede2dfba972a · 2021-10-03T17:29:44.000+01:00
diff --git a/setup.rst b/setup.rst
@@ -447,7 +447,14 @@ example, ``autoconf`` by itself will not regenerate ``pyconfig.h.in``.
 appropriate.
 
 Python's ``configure.ac`` script typically requires a specific version of
-Autoconf.  At the moment, this reads: ``AC_PREREQ(2.69)``.
+Autoconf.  At the moment, this reads: ``AC_PREREQ(2.69)``. It also requires
+to have the ``pkg-config`` utility installed in the system and the ``pkg.m4``
+macro file located in the approapiate ``alocal`` location. You can easily check
+if this is correctly configured by running:
+
+.. code-block:: bash
+
+   ls $(aclocal --print-ac-dir) | grep pkg.m4
 
 If the system copy of Autoconf does not match this version, you will need to
 install your own copy of Autoconf.
