libmng installation failure

[David Moylan]

Still trying to figure out why libmng won't configure properly.  No 
Makefile is created when ./configure is run.

This is the output from

sudo port -vd configure libmng

Do the requested variant messages indicate the problem?

DEBUG: Found port in 
file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/graphics/libmng
DEBUG: Changing to port directory: 
/opt/local/var/macports/sources/rsync.macports.org/release/ports/graphics/libmng
DEBUG: Requested variant powerpc is not provided by port libmng.
DEBUG: Requested variant darwin is not provided by port libmng.
DEBUG: Requested variant macosx is not provided by port libmng.
DEBUG: Found port in 
file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/graphics/jpeg
DEBUG: Changing to port directory: 
/opt/local/var/macports/sources/rsync.macports.org/release/ports/graphics/jpeg
DEBUG: Requested variant powerpc is not provided by port jpeg.
DEBUG: Requested variant darwin is not provided by port jpeg.
DEBUG: Requested variant macosx is not provided by port jpeg.
DEBUG: Searching for dependency: jpeg
DEBUG: Found Dependency: receipt exists for jpeg
DEBUG: Found port in 
file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/graphics/lcms
DEBUG: Changing to port directory: 
/opt/local/var/macports/sources/rsync.macports.org/release/ports/graphics/lcms
DEBUG: Requested variant powerpc is not provided by port lcms.
DEBUG: Requested variant darwin is not provided by port lcms.
DEBUG: Requested variant macosx is not provided by port lcms.
DEBUG: Searching for dependency: lcms
DEBUG: Found Dependency: receipt exists for lcms
DEBUG: Found port in 
file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/archivers/zlib
DEBUG: Changing to port directory: 
/opt/local/var/macports/sources/rsync.macports.org/release/ports/archivers/zlib
DEBUG: Requested variant powerpc is not provided by port zlib.
DEBUG: Requested variant darwin is not provided by port zlib.
DEBUG: Requested variant macosx is not provided by port zlib.
DEBUG: Searching for dependency: zlib
DEBUG: Found Dependency: receipt exists for zlib
DEBUG: Skipping completed org.macports.main (libmng)
DEBUG: Skipping completed org.macports.fetch (libmng)
DEBUG: Skipping completed org.macports.checksum (libmng)
DEBUG: Skipping completed org.macports.extract (libmng)
DEBUG: Skipping completed org.macports.patch (libmng)
DEBUG: Skipping completed org.macports.configure (libmng)