Log Message:
Update to 0.28:

pkg-config 0.28
===
- Fixed a pair of long-standing and intertwined bugs involving unwanted
  removal of flags. The first is that other Libs flags like -Wl are now
  kept in context order with -l flags. The second is that aggressive
  removal of all duplicate arguments has been scaled back so that just
  consecutive duplicate arguments are removed. One result of this change
  is that some flags could be repeated in the final output, especially
  flags from non-pkg-config packages like -lm. Since pkg-config rarely
  has enough knowledge here about the right thing to do, we throw the
  duplicate arguments at the compiler/linker and trust it will do the
  right thing.
- Fixed an old bug to allow circular Requires. This fix brings along a
  small behavior change in that pkg-config resolves requires depth
  first, causing some lower level flags to show up earlier in the output
  than previously.
- Cleaned up many corner-case bugs and ambiguous behavior in
  pkg-config's interface. Thanks to Michał Górny for finding so many of
  these.
- New autoconf macro PKG_CHECK_VAR for reading variables from .pc files.
- Default to suppressing -L/lib and/or -L/lib64 like their /usr
  counterparts.
- To help support multiarch scenarios out of the box, $host-pkg-config
  is now installed unless --disable-host-tool is passed to configure.
***disabled in pkgsrc***
- Added optional gcov usage through the --with-gcov configure option. As
  a result, many more tests were added to greatly increase the coverage
  of the code to 86% of executed lines on a Fedora 18 machine.
- Bugs fixed: 130, 7331, 16101, 17053, 19950, 34504, 48098, 54231,
  54271, 54379, 54384, 54386, 54388, 54389, 54390, 54391, 54427, 54463,
  54716, 57078, 58363, 59435.