Bug 596433

Description of problem:
With this build:
http://koji.fedoraproject.org/koji/taskinfo?taskID=2211258
Build failed with
--------------------------------------------------------
Package dbus-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `dbus-1.pc'
to the PKG_CONFIG_PATH environment variable
Package 'dbus-1', required by 'gconf', not found
--------------------------------------------------------

Now rpmbuild detects and adds pkgconfig based dependency, the
issue like this should not occur (because GConf2-devel is surely
in buildroot!)

gconf-2.0.pc says:
------------------------------------------------------
Requires: glib-2.0
Requires.private: ORBit-2.0 dbus-1
------------------------------------------------------
However with GConf2-devel-2.31.3-1.fc14.i686 :
http://koji.fedoraproject.org/koji/rpminfo?rpmID=1990870
Requires(dbus-1) does not appear in Requires. On the other hand,
with GConf2-devel-2.28.1-1.fc13.i686:
http://koji.fedoraproject.org/koji/rpminfo?rpmID=1896589
Requires(dbus-1) is actually there.

/usr/lib/rpm/pkgconfigdeps.sh says:
=======================================================
    34  -R|--requires)
    35      while read filename ; do
    36      case "${filename}" in
    37      *.pc)
    38          i="`expr $i + 1`"
    39          [ $i -eq 1 ] && echo "$pkgconfig"
    40          DIR="`dirname ${filename}`"
    41          export PKG_CONFIG_PATH="$DIR:$DIR/../../share/pkgconfig"
    42          $pkgconfig --print-requires "$filename" 2> /dev/null | while read n r v ; do
    43              [ -n "$n" ] || continue
    44              echo -n "pkgconfig($n) "
    45              [ -n "$r" ] && [ -n "$v" ] && echo -n "$r" "$v"
    46              echo
    47          done
    48      esac
======================================================
so the dependency detection by rpmbuild uses the result
of "pkg-config --print-requires".

With pkgconfig-0.23-9.fc12.i686:
$ pkg-config --print-requires ./gconf-2.0.pc
glib-2.0
ORBit-2.0
dbus-1
glib-2.0

With pkgconfig-0.24-2.fc14.i686:
$ pkg-config --print-requires ./gconf-2.0.pc
glib-2.0

And even if with pkgconfig-0.24-2.fc14.i686, even if --print-requires
only returns glib-2.0, if dbus-1.pc is not found, pkg-config shows
the error:
$ pkg-config --cflags gconf-2.0
Package dbus-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `dbus-1.pc'
to the PKG_CONFIG_PATH environment variable
Package 'dbus-1', required by 'gconf', not found

Version-Release number of selected component (if applicable):
pkgconfig-0.24-2.fc14

How reproducible:
100%