[Buildroot] implicit declaration of function 'vrndn_f64' on glibc compile

[daggs]

Greetings,

I've tried to build a odroidc2 based image with glibc instead of uclibc and the build process fails with the following error:
../sysdeps/aarch64/fpu/math_private.h:332:3: error: implicit declaration of function 'vrndn_f64' [-Werror=implicit-function-declaration]

has anyone encountered this issue before?
steps to reproduce:
1. checkout buildroot master.
2. run make odroidc2_defconfig
3. run make menuconfig and change the libc to glibc.
4. rum make.

Dagg.