Hi, If the symbol BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined (see <boost/math/tools/config.hpp>) then the build fails [1] as follows: libs/math/build/has_long_double_support.cpp:9:2: error: #error "long double support is not supported by Boost.Math on this Plaform: the long double version of the TR1 library will not be built." ...failed gcc.compile.c++ bin.v2/libs/math/build/has_long_double_support.test/gcc-4.3.2/release/debug-symbols-on/link-static/has_long_double_support.o... and several others, ending with: ...failed updating 8 targets... ...skipped 368 targets... ...updated 2074 targets... make: *** [build-stamp] Error 1 The failure is caused by an #error directive in has_long_double_support.cpp, suggesting this behaviour is deliberate. How can this be made to be non-fatal? Thanks, -Steve P.S. The behaviour is easy to reproduce: just stick #define BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS into config.hpp. [1] http://buildd.debian.org/fetch.cgi?&pkg=boost1.36&ver=1.36.0-3&arch=hppa&stamp=1226326109&file=log