CHECK_CXX_SOURCE_COMPILES(
"#include  <fenv.h>
int main() { 
  fesetround(FE_TONEAREST);
  return 0;
}" HAVE_FESETROUND)

CHECK_FUNCTION_EXISTS (fesetround HAVE_FESETROUND)

CHECK_CXX_SOURCE_COMPILES(
"#include  <fenv.h>
int main() { 
  fesetround(FE_TONEAREST);
  return 0;
}" HAVE_FESETROUND)