build error on mac os 10.14.1

Hello

    when build on mac os 10.14.1 with the master branch, I got the
error as blew, so what is wrong?

ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 clangclang: error: linker command failed with exit code 1 (use -v to see invocation) : error: linker command failed with exit code 1 (use -v to see invocation) clang: error: linker command failed with exit code 1 (use -v to see invocation) clangmake: *** [Makefile:2369: git-shell] Error 1 make: *** Waiting for unfinished jobs.... make: *** [Makefile:2369: git-sh-i18n--envsubst] Error 1 : error: linker command failed with exit code 1 (use -v to see invocation) clang: make: *** [Makefile:2369: git-credential-cache--daemon] Error 1 error: linker command failed with exit code 1 (use -v to see invocation) clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2369: git-credential-cache] Error 1 make: *** [Makefile:2369: git-credential-store] Error 1 make: *** [Makefile:2383: git-remote-testsvn] Error 1 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2393: git-remote-http] Error 1 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2369: git-http-backend] Error 1 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2372: git-imap-send] Error 1 make: *** [Makefile:2379: git-http-push] Error 1 clang: error: linker command failed with exit code 1 (use -v to see invocation) clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2376: git-http-fetch] Error 1 make: *** [Makefile:2369: git-daemon] Error 1 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2369: git-fast-import] Error 1 ld: archive has no table of contents file 'xdiff/lib.a' for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Makefile:2046: git] Error 1