I plan on adding the following to the BUILD_INFO_FILE: (aka +BUILD_INFO):

DATE, CATEGORIES, MAINTAINER, PKGTOOLS_VERSION and HOMEPAGE

It has been at least a couple years since DATE was discussed and for two 
years I have been setting it to just normal date (%a %b %e %H:%M:%S %Z %Y) 
format. This is the build/packaging time. Do you have any suggestion for 
easier parsable format? Epoch, like DATE=1144412567, is not quickly human 
readable.

I have also been recording the MAINTAINER in mine for over two years. But 
we don't include this on the README.html webpages. It seems like this was 
discussed before. I like to know as a package user (even not pkgsrc) who 
made the package (even if some non-human autobuild user). But I think 
others didn't want this info. I can make this optional (off by default) or 
just don't include it if this is the consensus.

Adding CATEGORIES is simple. I discussed with another developer and we 
decided to just keep same format (all on one line).

HOMEPAGE will be redundant -- as is now currently also in the +DESC.

PKGTOOLS_VERSION is easy. (See my other email.) I will just rename 
_PKGTOOLS_VER.

Here is a patch (I have been using part of this for over two years):

diff -u -r1.1813 bsd.pkg.mk
--- mk/bsd.pkg.mk	6 Apr 2006 06:23:05 -0000	1.1813
+++ mk/bsd.pkg.mk	7 Apr 2006 12:47:56 -0000
@@ -420,6 +420,10 @@
 _PKGSRC_BUILD_TARGETS=	build
 .endif
 
+.if !defined(THE_DATE)
+THE_DATE!=	${DATE}
+.endif
+
 # The user can override the NO_PACKAGE by specifying this from
 # the make command line
 .if defined(FORCE_PACKAGE)
@@ -3533,7 +3537,7 @@
 	@${ECHO} "GMAKE=`${GMAKE} --version | ${GREP} Make`" >> ${BUILD_INFO_FILE}
 .  endif
 	${_PKG_SILENT}${_PKG_DEBUG}					\
-	${ECHO} "_PKGTOOLS_VER=${PKGTOOLS_VERSION}" >> ${BUILD_INFO_FILE}
+	${ECHO} "PKGTOOLS_VERSION=${PKGTOOLS_VERSION}" >> ${BUILD_INFO_FILE}
 .endif
 
 .PHONY: post-install-fake-pkg
@@ -3611,6 +3615,14 @@
 	done
 .  endif
 	${_PKG_SILENT}${_PKG_DEBUG}					\
+	${ECHO} "HOMEPAGE=${HOMEPAGE}" >> ${BUILD_INFO_FILE}
+	${_PKG_SILENT}${_PKG_DEBUG}					\
+	${ECHO} "CATEGORIES=${CATEGORIES}" >> ${BUILD_INFO_FILE}
+	${_PKG_SILENT}${_PKG_DEBUG}					\
+	${ECHO} "MAINTAINER=${MAINTAINER}" >> ${BUILD_INFO_FILE}
+	${_PKG_SILENT}${_PKG_DEBUG}					\
+	${ECHO} "DATE=${THE_DATE}" >> ${BUILD_INFO_FILE}
+	${_PKG_SILENT}${_PKG_DEBUG}					\
 	size_this=`${MAKE} ${MAKEFLAGS} print-pkg-size-this`;		\
 	size_depends=`${MAKE} ${MAKEFLAGS} print-pkg-size-depends`;	\
 	${ECHO} $$size_this >${SIZE_PKG_FILE};				\


This data will be used for generating the package summary database as 
already discussed in great detail. (I already tested patch from another 
developer; I will wait for him to make public.)

 Jeremy C. Reed