FreeBSD 11.0 i386 Stable
I successfully upgraded from FreeBSD 10.3 to 11.0 Stable on 23 September 2016.
Upon refreshing and rebuilding world to catch the 28 September 2016 Release
update,
buildworld failed using the same build options that had worked for the 22 Sept
code.
Tail:
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Lessons learned from source upgrade from FreeBSD i386 9.2 Stable to FreeBSD i386
10.0 Release.
A)
Clang is needed to compile FreeBSD 10 due to use of the updated libstdc++ in
world.
My workaround was to upgrade FreeBSD 9.2 to Clang 3.3 in the base system
and remove GCC 4.2.1 from base 9.2.