编译facebook flow时，Ubuntu 14.04 64位，我收到错误。有谁知道问题是什么？
ubuntu@ubuntu:~/Downloads/flow-0.18.1$ make
mkdir -p bin
tar czf bin/flowlib.tar.gz -C lib .
echo "const char* const BuildInfo_kRevision = \"$(git rev-parse HEAD 2>/dev/null || hg identify -i)\";" > hack/utils/get_build_id.gen.c
abort: there is no Mercurial repository here (.hg not found)
ocamlbuild -ocamlc "ocamlopt -ccopt -DNO_LZ4"\
hack/third-party/inotify/inotify_stubs.o hack/heap/hh_shared.o hack/hhi/hhi_elf.o hack/utils/files.o hack/utils/get_build_id.gen.o hack/utils/get_build_id.o hack/utils/handle_stubs.o hack/utils/nproc.o hack/utils/realpath.o hack/utils/sysinfo.o src/embedded/flowlib_elf.o
+ ocamlopt -ccopt -DNO_LZ4 -c hack/hhi/hhi_elf.c
hack/hhi/hhi_elf.c: In function ‘get_embedded_hhi_data’:
hack/hhi/hhi_elf.c:116:3: warning: ‘elf_getshstrndx’ is deprecated (declared at /usr/include/libelf.h:260) [-Wdeprecated-declarations]
int stat = elf_getshstrndx(e, &shstrndx);
^
+ ocamlopt -ccopt -DNO_LZ4 -c src/embedded/flowlib_elf.c
src/embedded/flowlib_elf.c: In function ‘get_embedded_flowlib_data’:
src/embedded/flowlib_elf.c:65:3: warning: ‘elf_getshstrndx’ is deprecated (declared at /usr/include/libelf.h:260) [-Wdeprecated-declarations]
int stat = elf_getshstrndx(e, &shstrndx);
^
Finished, 22 targets (0 cached) in 00:00:01.
ocamlbuild -no-links -I src/commands -I src/common -I src/dts -I src/embedded -I src/parser -I src/parsing -I src/server -I src/stubs -I src/typing -I hack/deps -I hack/dfind -I hack/find -I hack/globals -I hack/heap -I hack/parsing -I hack/procs -I hack/search -I hack/socket -I hack/stubs -I hack/third-party/avl -I hack/third-party/core -I hack/utils -I hack/third-party/inotify -I hack/fsnotify_linux -lib unix -lib str -lflags "hack/third-party/inotify/inotify_stubs.o hack/heap/hh_shared.o hack/hhi/hhi_elf.o hack/utils/files.o hack/utils/get_build_id.gen.o hack/utils/get_build_id.o hack/utils/handle_stubs.o hack/utils/nproc.o hack/utils/realpath.o hack/utils/sysinfo.o src/embedded/flowlib_elf.o -cclib -l -cclib elf " src/flow.native
这是错误：
+ /usr/bin/ocamlc -c -w A -warn-error A -w -27-32-34-45 -w -4-6-29-35-44-48-50 -I src/server -I hack/find -I hack/procs -I hack/fsnotify_linux -I hack/heap -I hack/deps -I hack/globals -I hack/dfind -I hack/parsing -I hack/stubs -I hack/search -I hack/utils -I hack/socket -I hack/third-party/inotify -I hack/third-party/avl -I hack/third-party/core -I src/commands -I src/dts -I src/typing -I src/parsing -I src/stubs -I src/common -I src/parser -I src/embedded -o src/server/autocompleteService_js.cmo src/server/autocompleteService_js.ml
具体细节：
File "src/server/autocompleteService_js.ml", line 128, characters 14-29:
Error: Unbound value Debug.json_of_t
Command exited with code 2.
Compilation unsuccessful after building 114 targets (0 cached) in 00:00:05.
make: *** [build-flow] Error 10