undefined reference to `fiber_switchContext'

[Mahdi via D.gnu]

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/libgphobos.so: 
undefined reference to `fiber_switchContext'
collect2: error: ld returned 1 exit status
I have this problem after installing GDC 11.
I installed gcc,g++ and gdc version 11 from unofficial 
repositories on Ubuntu 20.04.