[boost] boost thread rev 77005 fails on cygwin due SIGSTKSZ not defined

All, Boost Thread no longer compiles on Cygwin 1.7.10 / g++ (GCC) 4.5.3 since SIGSTKSZ is not defined on this platform: cc.compile.c++ bin.v2/libs/context/build/gcc-4.5.3/release/threading-multi/stack_utils_posix.o libs\context\src\stack_utils_posix.cpp: In function ‘rlimit<unnamed>::stacksize_limit_()’: libs\context\src\stack_utils_posix.cpp:27:15: warning: unused variable ‘result’ libs\context\src\stack_utils_posix.cpp: In function ‘size_t boost::contexts::minimum_stacksize()’: libs\context\src\stack_utils_posix.cpp:52:10: error: ‘SIGSTKSZ’ was not declared in this scope libs\context\src\stack_utils_posix.cpp:52:20: warning: control reaches end of non-void function Any suggested workarounds? Thank you, -- Bernd