CLANG buildworld failure: lint: cannot exec /usr/obj/usr/src/tmp/usr/bin/cc: No such file or directory

Buildworld of FBSD 10.o-CUR/amd64 fails with the below shown error
messages since this weekend:


clang -O2 -pipe -O2 -fno-strict-aliasing -pipe -pipe -O3
-fno-strict-aliasing -march=native
-I/usr/src/usr.bin/xlint/xlint/../lint1 -DPREFIX=\"\"
-I/usr/src/usr.bin/xlint/xlint/../arch/amd64
-I/usr/src/usr.bin/xlint/xlint/../common -std=gnu99 -fstack-protector
-Wsystem-headers -Wall -Wno-format-y2k -W -Wno-unused-parameter
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type
-Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter
-Wcast-align -Wchar-subscripts -Winline -Wnested-externs
-Wredundant-decls -Wold-style-definition -Wno-pointer-sign  -o xlint
xlint.o mem.o
clang: warning: argument unused during compilation: '-std=gnu99'
gzip -cn /usr/src/usr.bin/xlint/xlint/lint.1 > lint.1.gz
===> usr.bin/xlint/llib (all)
lint -cghapbx -Cposix /usr/src/usr.bin/xlint/llib/llib-lposix
llib-lposix:
lint: cannot exec /usr/obj/usr/src/tmp/usr/bin/cc: No such file or directory
*** [llib-lposix.ln] Error code 1

Stop in /usr/src/usr.bin/xlint/llib.
*** [all] Error code 1

Stop in /usr/src/usr.bin/xlint.
*** [all] Error code 1

Stop in /usr/src/usr.bin.
*** [usr.bin.all__D] Error code 1

Stop in /usr/src.
*** [everything] Error code 1

Stop in /usr/src.
*** [buildworld] Error code 1

Stop in /usr/src.


Regards,
Oliver