If you’re trying to install p5-XML-SAX-0.99 and get a
Can't locate XML/SAX/Exception.pm in @INC
error then you may need to
cd /usr/ports/textproc/p5-XML-SAX-Base make distclean make deinstall make install clean
Then you can
cd /usr/ports/textproc/p5-XML-SAX make distclean make install clean
And you should get an error free install. Apparently p5-XML-SAX-Base is a prereq that isn’t getting cleanly detected or updated in the make process for p5-XML-SAX.