Disable check for function feenableexcept()

configure.ac

@@ -133,7 +133,8 @@ fi
 AC_DEFINE_UNQUOTED([SYSTEM_TYPE],["$ac_cv_build"], [System type])
 AC_SUBST([SYSTEM_TYPE],["$ac_cv_build"])
 #  ----------------------------------------------------------------------
-AC_CHECK_FUNCS(feenableexcept)
+# check for feenableexcept needs to define macro __USE_GNU and to include fenv.h
+# AC_CHECK_FUNCS(feenableexcept)
 #
 AC_CHECK_MEMBERS([fenv_t.__control, fenv_t.__mxcsr],,,[[#include <fenv.h>]])