So... the plan B would be to change select_compiler.hpp to only forward to pathscale.hpp when __PATHSCALE__ >= 4.
I wrote it to do this. If it doesn't do it, then someone reverted/changed it.
Nope: https://svn.boost.org/trac/boost/changeset/67707 The plan would be to change to: Index: select_compiler_config.hpp =================================================================== --- select_compiler_config.hpp (revision 68366) +++ select_compiler_config.hpp (working copy) @@ -52,7 +52,7 @@ // Comeau C++ # define BOOST_COMPILER_CONFIG "boost/config/compiler/comeau.hpp" -#elif defined __PATHSCALE__ +#elif defined(__PATHSCALE__) && (__PATHSCALE__ >= 4) // PathScale EKOPath compiler (has to come before clang and gcc) # define BOOST_COMPILER_CONFIG "boost/config/compiler/pathscale.hpp" John.