make: *** [s2rd] Error 1

> stupidvalve.o: In function `print_object_recursive':
> stupidvalve.c:(.text+0xbca): undefined reference to `fesetround'
> collect2: error: ld returned 1 exit status
> Makefile:15: recipe for target 's2rd' failed
> make: *** [s2rd] Error 1