In file included from simgear/scene/material/Effect.cxx:21:
simgear/scene/material/Effect.hxx:22:10: fatal error: 'boost/tr1/unordered_map.hpp' file not found
1 error generated.
Thanks for reporting that issue. Is there a way to reproduce that problem ? Can you provide an early version of the port v1.65 ?
See bug 220714 which has a link to the patch and see bug 220715 for an example fix.
A commit references this bug:
Date: Mon Jul 17 12:25:10 UTC 2017
New revision: 446068
Remove tr1 dependency to prepare for Boost 1.65
Submitted by: jbeich
Fix committed, thanks!
(I hope the patch won't break build on non i386 / amd64 archs)
Don't you need to add USES=compiler:c++11-lib when using C++11 headers/features? powerpc*, sparc64 and mips* are still using old GCC/libstdc++ in base. USES=compiler:c++11-lib implies USE_GCC on those architectures, so you can drop explicit USE_GCC in simgear/Makefile.
Unrelatedly, BROKEN_powerpc64 can probably be fixed by adding -D_GLIBCXX_USE_C99 to CXXFLAGS per bug 193528.