conflicts aren't being detected

[ryandesign (Ryan Carsten Schmidt)]

MacPorts isn't detecting conflicts that ports declare:

$ grep conflict $(port file name:pixman)
/Users/rschmidt/macports/dports/graphics/libpixman/Portfile:conflicts               libpixman-devel
/Users/rschmidt/macports/dports/graphics/libpixman-devel/Portfile:conflicts               libpixman
$ port installed name:pixman
The following ports are currently installed:
  libpixman @0.18.2_0+universal (active)
$ sudo port install libpixman-devel
--->  Computing dependencies for libpixman-devel
--->  Fetching libpixman-devel
--->  Verifying checksum(s) for libpixman-devel
--->  Extracting libpixman-devel
--->  Configuring libpixman-devel
--->  Building libpixman-devel
--->  Staging libpixman-devel into destroot
--->  Installing libpixman-devel @0.17.14_0+universal
--->  Activating libpixman-devel @0.17.14_0+universal
Error: Target org.macports.activate returned: Image error: /opt/local/include/pixman-1/pixman-version.h is being used by the active libpixman port.  Please deactivate this port first, or use 'port -f activate libpixman-devel' to force the activation.
Log for libpixman-devel is at: /opt/local/var/macports/logs/_Users_rschmidt_macports_dports_graphics_libpixman-devel/main.log
Error: Status 1 encountered during processing.
To report a bug, see <http://guide.macports.org/#project.tickets>
$

1.9 branch @68967

[jmroot (Joshua Root)]

r69105