Log Message:
(pkgsrc)
- MASTER_SITES moved
- DIST_SUBDIR is now used.
- pre-configure:, post-build: added for Makefile
- Some tweak added (post-build: etc) to get similar PLIST (as of 0.2.6)

(upstream)
Update 0.2.6 to 0.3.1
From: http://www.fresse.org/dateutils/changelog.html
v0.3.1
------------------------
This is a bugfix release.

Bugfixes:
 -  octave/matlab code is distributed fully
 -  negative durations with refined units are minus-signed only once
 -  ddiff is entirely anticommutative now
 -  tests don¢Âª®t fail if zones don¢Âª®t exist on the build system
 -  dseq with empty ranges will no longer produce output (just as seq(1))
 -  arbitrary integers are not interpreted as time anymore
 -  when converting from zone info properly clear zone difference for %Z
 -  dseq(1) will automatically resort to +1mo and +1y iterators for wildcarded \ 
ymd dates
 -  dadd(1)¢Âª®ing ywd dates with output as ymd works properly now

Features:
 -  ddiff can output nanosecond diffs
 -  automatic fix-up of dates is documented now
 -  parser errors and fix ups are reported through return code 2
 -  dseq with no -f|--format stays in the calendric system of
    the start value instead of converting all output to ymd

v0.3.0
------------------------
This is a feature release.

Features:
 -  dgrep supports time zones both for the expression and the input
 -  timezones can be specified by alternative codes and tzmap files
 -  new tool dzone to inspect date/times in multiple timezones in bulk
 -  new tool dsort to sort input chronologically
 -  gengetopt and help2man maintainer dependencies removed
 -  lilian/julian inputs via -i ldn and -i jdn
 -  ymcw dates now follow ISO 8601 in using 07 to denote Sunday

Bugfixes:
 -  ddiff takes differences between a unix epoch stamp and a date/time
 -  zone converter assigns correct sign to zone difference when using %Z
 -  weekdays are properly calculated from epoch stamps (issue 24)

v0.2.7
--------------------------
This is a feature release.

Features:
 -  dgrep supports -v|--invert-match like grep
 -  output specifier %G is supported for compatibility with POSIX
 -  ddiff calculates year-day differences
 -  ddiff calculates ISO-week date differences
 -  ddiff output can be zero and space padded through 0 and SPC modifier
 -  zoneinfo database on AIX >= 6.1 is taken into account

Bug fixes:
 -  ddiff can calculate full year differences, issue 21 fixed
 -  dseq now accepts %W, %V output formats, issue 22 fixed
 -  builds with clang >= 3.3 work again, clang bug 18028