/usr/local/libexec/ccache/clang  -O2 -pipe -w  -I/usr/src/lib/libc/include -I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/amd64 -DNLS  -D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa -I/usr/src/lib/libc/../../contrib/libc-vis -DINET6 -I/usr/obj/usr/src/lib/libc -I/usr/src/lib/libc/resolv -D_ACL_PRIVATE -DPOSIX_MISTAKE -I/usr/src/lib/libc/../../contrib/jemalloc/include -I/usr/src/lib/libc/../../contrib/tzcode/stdtime -I/usr/src/lib/libc/stdtime  -I/usr/src/lib/libc/locale -DBROKEN_DES -DPORTMAP -DDES_BUILTIN -I/usr/src/lib/libc/rpc -DYP -DNS_CACHING -DSYMBOL_VERSIONING -std=gnu99 -Qunused-arguments -fstack-protector -Wsystem-headers -Wall -Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -Wno-empty-body -Wno-string-plus-int -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-unused-function -Wno-conversion -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter -c /usr/src/lib/libc/locale/xlocale.c -o xlocale.o
/usr/local/libexec/ccache/clang  -O2 -pipe -w  -I/usr/src/lib/libc/include -I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/amd64 -DNLS  -D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa -I/usr/src/lib/libc/../../contrib/libc-vis -DINET6 -I/usr/obj/usr/src/lib/libc -I/usr/src/lib/libc/resolv -D_ACL_PRIVATE -DPOSIX_MISTAKE -I/usr/src/lib/libc/../../contrib/jemalloc/include -I/usr/src/lib/libc/../../contrib/tzcode/stdtime -I/usr/src/lib/libc/stdtime  -I/usr/src/lib/libc/locale -DBROKEN_DES -DPORTMAP -DDES_BUILTIN -I/usr/src/lib/libc/rpc -DYP -DNS_CACHING -DSYMBOL_VERSIONING -std=gnu99 -Qunused-arguments -fstack-protector -Wsystem-headers -Wall -Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -Wno-empty-body -Wno-string-plus-int -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-unused-function -Wno-conversion -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter -c /usr/src/lib/libc/locale/c16rtomb.c -o c16rtomb.o
In file included from /usr/src/lib/libc/locale/c16rtomb.c:31:
/usr/src/lib/libc/../../include/uchar.h:36:9: error: unknown type name '__char16_t'; did you mean '__wchar_t'?
typedef __char16_t      char16_t;
        ^~~~~~~~~~
        __wchar_t
/usr/include/x86/_types.h:145:14: note: '__wchar_t' declared here
typedef int             __wchar_t;
                        ^
In file included from /usr/src/lib/libc/locale/c16rtomb.c:31:
/usr/src/lib/libc/../../include/uchar.h:41:9: error: unknown type name '__char32_t'; did you mean '__wchar_t'?
typedef __char32_t      char32_t;
        ^~~~~~~~~~
        __wchar_t
/usr/include/x86/_types.h:145:14: note: '__wchar_t' declared here
typedef int             __wchar_t;
                        ^
2 errors generated.
*** Error code 1

Stop.
make: stopped in /usr/src/lib/libc
*** Error code 1

Stop.
make: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src
*** Error code 1

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

Stop in /usr/src.