Problems compiling kernel

Dear all,

on a system updated yesterday I get

tuexen@head:~/freebsd-src % git branch
* main
tuexen@head:~/freebsd-src % git pull
Already up to date.
tuexen@head:~/freebsd-src % uname -a
FreeBSD head 14.0-CURRENT FreeBSD 14.0-CURRENT #1 main-n252035-63f7f3921bd: Thu Dec 30 11:33:16 CET 2021     root@head:/usr/obj/usr/home/tuexen/freebsd-src/amd64.amd64/sys/TCP  amd64
tuexen@head:~/freebsd-src % sudo make -j 4 kernel KERNCONF=TCP
ld-elf.so.1: Shared object "libc++.so.1" not found, required by "cc"
make: "/usr/home/tuexen/freebsd-src/share/mk/bsd.compiler.mk" line 201: warning: "cc -v 2>&1 | grep "gcc version"" returned non-zero status
make: "/usr/home/tuexen/freebsd-src/share/mk/bsd.compiler.mk" line 205: Unable to determine compiler type for CC=cc.  Consider setting COMPILER_TYPE.

make: stopped in /usr/home/tuexen/freebsd-src
tuexen@head:~/freebsd-src % 

any idea what I did wrong and how to fix it?

Thanks for any hints.

Best regards
Michael