There appears to be a checksum mismatch on the recent gd-2.0.28 update:

=> gd-2.0.28.tar.gz doesn't seem to exist on this system.
=> Attempting to fetch gd-2.0.28.tar.gz from http://www.boutell.com/gd/http/.
=> [568740 bytes]
Requesting http://www.boutell.com/gd/http/gd-2.0.28.tar.gz
100% |*************************************|   555 KB  123.36 KB/s    00:00 ETA
568797 bytes retrieved in 00:04 (123.15 KB/s)
=> Checksum mismatch for gd-2.0.28.tar.gz.
Make sure the Makefile and checksum file (/usr/pkgsrc/graphics/gd/distinfo)
are up to date.