boost176 lacks math_tr1 on 10.6.8?

[barracuda156]

madness port fails on 10.6.8 Intel (only there):

CMake Error at /opt/local/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find Boost (missing: math_tr1) (found suitable version "1.76.0",
  minimum required is "1.4")
Call Stack (most recent call first):
  /opt/local/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
  /opt/local/share/cmake-3.24/Modules/FindBoost.cmake:2376 (find_package_handle_standard_args)
  external/boost.cmake:3 (find_package)
  CMakeLists.txt:641 (include)


-- Configuring incomplete, errors occurred!

​https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/156700/steps/install-port/logs/stdio ​https://build.macports.org/builders/ports-10.6_i386-builder/builds/121596/steps/install-port/logs/stdio

It works for me locally both on 10.6 PPC and 10.6.8 Rosetta with GCC. (I need to check if I have the latest revision of boost176, but I believe recent revbumps did not change anything in terms of components installed.)