Port error: USE_FIREFOX doesn't work correctly

[Douglas William Thrift]

>Submitter-Id:	current-users
>Originator:	Douglas William Thrift
>Organization:	
>Confidential:	no 
>Synopsis:	Port error: USE_FIREFOX doesn't work correctly
>Severity:	critical
>Priority:	high
>Category:	ports
>Class:		sw-bug
>Release:	FreeBSD 8.3-RELEASE-p1 amd64
>Environment:
System: FreeBSD justonenight.douglasthrift.net 8.3-RELEASE-p1 FreeBSD 8.3-RELEASE-p1 #9: Thu May 3 10:57:52 PDT 2012 root at justonenight.douglasthrift.net:/usr/obj/usr/src/sys/FURTHERONUPTHEROAD amd64
>Description:
I was working on updating my port www/py-selenium and when I went to make the distinfo for the new distfile, I got the following:

===>  py27-selenium-2.21.3 cannot install: unknown Firefox version: firefox-3.6+.
*** Error code 1

Stop in /home/douglas/freebsd/www/py-selenium.
*** Error code 1

Stop in /home/douglas/freebsd/www/py-selenium.


I looked at /usr/ports/Mk/bsd.gecko.mk and discovered that the value 36+ was no
longer listed, so much for backward compatibility with ports, but fair enough.
Based on this I changed the value of USE_FIREFOX to 10+, but that didn't make
things any better:

===>  py27-selenium-2.21.3 cannot install: Firefox versions mismatch: firefox-12 is installed and wanted version is firefox-10+.
*** Error code 1

Stop in /home/douglas/freebsd/www/py-selenium.
*** Error code 1

Stop in /home/douglas/freebsd/www/py-selenium.


That definitely doesn't seem right! I tried 12 and 12+ and they both worked
okay, but the port should also support the Firefox 10 line. It looks like my
port is the only one so far to even use the + functionality so I guess I
shouldn't be surprised by this.

I'm also a bit puzzled at the choice of 10 rather than 10+ for USE_FIREFOX= yes.
>How-To-Repeat:
Write a port with USE_FIREFOX set to 10+ and try to build it on a system with
Firefox 12 installed.
>Fix: