[xorg-server fail to build]

hello,

I am installing Funtoo and I an stuck at xserver fail to compile:

first issue was related to media-libs/libglvnd-1.3.2/mesa I have got compile error without any additional information.

I created /etc/portage/package.mask

=media-libs/libglvnd-1.3.2

run

ego sync

emerge -auDN @world

also tried

emerge -DNupv world --with-bdeps=y

this got me through mesa compilation, but now I am stuck with x11-base/xorg-server-1.2.8-r1::core-gl-kit failed (compile phase): emake failed

is this a bug (I have seen similar issues/blockages related to libglvnd with gentoo)? If not, how can I fix this?

thank you