diff -r -u boost_1_38_0.orig/boost/math/special_functions/expm1.hpp boost_1_38_0/boost/math/special_functions/expm1.hpp
--- boost_1_38_0.orig/boost/math/special_functions/expm1.hpp	2009-01-07 08:37:59.000000000 -0800
+++ boost_1_38_0/boost/math/special_functions/expm1.hpp	2009-04-20 18:24:33.312485307 -0700
@@ -267,10 +267,12 @@
 #if defined(BOOST_HAS_EXPM1) && !(defined(__osf__) && defined(__DECCXX_VER))
 #  ifdef BOOST_MATH_USE_C99
 inline float expm1(float x, const policies::policy<>&){ return ::expm1f(x); }
+#    ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
 inline long double expm1(long double x, const policies::policy<>&){ return ::expm1l(x); }
-#else
+#    endif
+#  else
 inline float expm1(float x, const policies::policy<>&){ return ::expm1(x); }
-#endif
+#  endif
 inline double expm1(double x, const policies::policy<>&){ return ::expm1(x); }
 #endif