thunderbird fails to build (icu?)

[Greg Troxel <gdt%lexort.com@localhost>]

I have avoided rebuilding thunderbird because it is so piggy in workdir
space, but am otherwise up to date from a day or so ago.

I am getting an error:

  In file included from Unified_cpp_intl_lwbrk0.cpp:2:
  /mnt/d0/n0/work/mail/thunderbird/work/thunderbird-115.1.1/intl/lwbrk/LineBreaker.cpp: In function 'int8_t GetClass(uint32_t, mozilla::intl::LineBreakRule, bool)':
  /mnt/d0/n0/work/mail/thunderbird/work/thunderbird-115.1.1/intl/lwbrk/LineBreaker.cpp:439:28: error: static assertion failed: Gecko vs ICU LineBreak class mismatch
    439 |   static_assert(U_LB_COUNT == mozilla::ArrayLength(sUnicodeLineBreakToClass),
        |                 ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




  https://wiki.linuxfromscratch.org/blfs/ticket/18799

which points to something I am not really understanding:

  https://wiki.linuxfromscratch.org/blfs/changeset/4ae4523d5583bd0e6ad57aa6ed32a2c9fa00e050/



Is anybody else seeing this?
What should we do?