Why is GCC not finding the library?

Question

linux

The test unit boost library references some functions on build:
libboost_unit_test_framework.so: undefined reference to `fedisableexcept'
libboost_unit_test_framework.so: undefined reference to `feenableexcept'
libboost_unit_test_framework.so: undefined reference to `fedisableexcept'
libboost_unit_test_framework.so: undefined reference to `feclearexcept'
Where can I get them from? specifying -ld in the makefile did nothing.

Answer 1

-ld
This is how you include the libd library, and you need libm