. bump PORTREVISION;
. trim Makefile headers;
. use one command REINPLACE_CMD instead of two commands SED and MV;
. do not hard code gcc at the source Makefile, build with the
default compiler and allow a compiler to be redefined;
. NOPORTDOCS -> PORT_OPTIONS:MDOCS;
. use ${PORTDOCS:S,^,${WRKDOC}/,} trick to install PORTDOCS;
. convert pkg-message to use SUB_FILES;
. fix the directory of additional documentation at pkg-message.