How to install watchman on Ubuntu 18.04, for react-native? error in make command

I have read this solution .

I wanted nodeman as dependency for react-native

no error upto ./configure command and it works fine as given solution

gd@gd10:/tmp$ git clone https://github.com/facebook/watchman.git
Cloning into 'watchman'...
remote: Counting objects: 18852, done.
remote: Compressing objects: 100% (103/103), done.
remote: Total 18852 (delta 50), reused 64 (delta 27), pack-reused 18718
Receiving objects: 100% (18852/18852), 12.37 MiB | 1011.00 KiB/s, done.
Resolving deltas: 100% (12582/12582), done.
gd@gd10:/tmp$ cd watchman/
gd@gd10:/tmp/watchman$ git checkout v4.7.0
Note: checking out 'v4.7.0'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b <new-branch-name>

HEAD is now at 93b67583 watchman: fixup recent test tweaks for windows
gd@gd10:/tmp/watchman$ sudo apt-get install -y autoconf automake build-essential python-dev libtool libssl-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
autoconf is already the newest version (2.69-11).
automake is already the newest version (1:1.15.1-3ubuntu2).
build-essential is already the newest version (12.4ubuntu1).
libssl-dev is already the newest version (1.1.0g-2ubuntu4).
libtool is already the newest version (2.4.6-2).
python-dev is already the newest version (2.7.15~rc1-1).
0 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
gd@gd10:/tmp/watchman$ ./autogen.sh
configure.ac:21: installing './compile'
configure.ac:2: installing './config.guess'
configure.ac:2: installing './config.sub'
configure.ac:3: installing './install-sh'
configure.ac:3: installing './missing'
Makefile.am: installing './depcomp'
parallel-tests: installing './test-driver'
gd@gd10:/tmp/watchman$ ./configure
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking how to run the C preprocessor... gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking whether byte ordering is bigendian... no
checking for inline... inline
checking for ranlib... ranlib
checking dependency style of gcc... gcc3
checking for arc... no
checking for python... /usr/bin/python
checking for python version... 2.7
checking for python platform... linux2
checking for python script directory... ${prefix}/lib/python2.7/dist-packages
checking for python extension module directory... ${exec_prefix}/lib/python2.7/dist-packages
checking for pcre-config... false
checking for PCRE using false... failed
checking for library containing pthread_create... -lpthread
checking for library containing socket... none required
checking for sys/types.h... (cached) yes
checking for inttypes.h... (cached) yes
checking locale.h usability... yes
checking locale.h presence... yes
checking for locale.h... yes
checking port.h usability... no
checking port.h presence... no
checking for port.h... no
checking sys/inotify.h usability... yes
checking sys/inotify.h presence... yes
checking for sys/inotify.h... yes
checking sys/event.h usability... no
checking sys/event.h presence... no
checking for sys/event.h... no
checking sys/ucred.h usability... no
checking sys/ucred.h presence... no
checking for sys/ucred.h... no
checking sys/socket.h usability... yes
checking sys/socket.h presence... yes
checking for sys/socket.h... yes
checking for mkostemp... yes
checking for kqueue... no
checking for port_create... no
checking for inotify_init... yes
checking for strtoll... yes
checking for localeconv... yes
checking for statfs... yes
checking for accept4... yes
checking for inotify_init1... yes
checking for getattrlistbulk... no
checking for openat... yes
checking for fdopendir... yes
checking for sys/vfs.h... yes
checking for sys/param.h... yes
checking for sys/mount.h... yes
checking for sys/statfs.h... yes
checking for sys/statvfs.h... yes
checking valgrind/valgrind.h usability... no
checking valgrind/valgrind.h presence... no
checking for valgrind/valgrind.h... no
checking execinfo.h usability... yes
checking execinfo.h presence... yes
checking for execinfo.h... yes
checking sys/resource.h usability... yes
checking sys/resource.h presence... yes
checking for sys/resource.h... yes
checking CoreServices/CoreServices.h usability... no
checking CoreServices/CoreServices.h presence... no
checking for CoreServices/CoreServices.h... no
checking for FSEventStreamSetExclusionPaths... no
checking for backtrace... yes
checking for backtrace_symbols... yes
checking for backtrace_symbols_fd... yes
checking for sys_siglist... yes
checking for memmem... yes
checking for struct statvfs.f_fstypename... no
checking for struct statvfs.f_basetype... no
checking that generated files are newer than configure... done
configure: creating ./config.status
config.status: creating Makefile
config.status: creating thirdparty/jansson/jansson_config.h
config.status: creating config.h
config.status: executing depfiles commands

Your build configuration:

        CPPFLAGS =  -D_REENTRANT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
        CFLAGS = -g -O2 -Wall -Wextra -Wdeclaration-after-statement -g -gdwarf-2 -fno-omit-frame-pointer
        LDFLAGS =
        prefix: /usr/local
        version: 4.7.0
        state directory: /usr/local/var/run/watchman

but error started after make command.

gd@gd10:/tmp/watchman$ make
make  all-am
make[1]: Entering directory '/tmp/watchman'
  CC       thirdparty/libart/src/art.o
  AR       libart.a
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       thirdparty/libtap_a-tap.o
  AR       libtap.a
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       thirdparty/wildmatch/wildmatch.o
  AR       libwildmatch.a
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       thirdparty/jansson/libwmanjson_a-dump.o
  CC       thirdparty/jansson/libwmanjson_a-error.o
  CC       thirdparty/jansson/libwmanjson_a-hashtable.o
  CC       thirdparty/jansson/libwmanjson_a-load.o
  CC       thirdparty/jansson/libwmanjson_a-memory.o
  CC       thirdparty/jansson/libwmanjson_a-pack_unpack.o
  CC       thirdparty/jansson/libwmanjson_a-strbuffer.o
  CC       thirdparty/jansson/libwmanjson_a-strconv.o
  CC       thirdparty/jansson/libwmanjson_a-utf.o
  CC       thirdparty/jansson/libwmanjson_a-value.o
  AR       libwmanjson.a
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       watchman-argv.o
  CC       watchman-envp.o
  CC       watchman-spawn.o
  CC       watchman-opt.o
  CC       watchman-cfg.o
  CC       watchman-clockspec.o
  CC       watchman-checksock.o
  CC       watchman-fstype.o
  CC       watchman-log.o
  CC       watchman-ignore.o
  CC       watchman-json.o
  CC       watchman-bser.o
  CC       watchman-expflags.o
  CC       watchman-hash.o
hash.c: In function ‘w_hash_bytes’:
hash.c:228:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 12: c+=((uint32_t)k[11])<<24;
                ~^~~~~~~~~~~~~~~~~~~~~~~
hash.c:229:7: note: here
       case 11: c+=((uint32_t)k[10])<<16;
       ^~~~
hash.c:229:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 11: c+=((uint32_t)k[10])<<16;
                ~^~~~~~~~~~~~~~~~~~~~~~~
hash.c:230:7: note: here
       case 10: c+=((uint32_t)k[9])<<8;
       ^~~~
hash.c:230:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 10: c+=((uint32_t)k[9])<<8;
                ~^~~~~~~~~~~~~~~~~~~~~
hash.c:231:7: note: here
       case 9 : c+=k[8];
       ^~~~
hash.c:231:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 9 : c+=k[8];
                ~^~~~~~
hash.c:232:7: note: here
       case 8 : b+=((uint32_t)k[7])<<24;
       ^~~~
hash.c:232:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 8 : b+=((uint32_t)k[7])<<24;
                ~^~~~~~~~~~~~~~~~~~~~~~
hash.c:233:7: note: here
       case 7 : b+=((uint32_t)k[6])<<16;
       ^~~~
hash.c:233:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 7 : b+=((uint32_t)k[6])<<16;
                ~^~~~~~~~~~~~~~~~~~~~~~
hash.c:234:7: note: here
       case 6 : b+=((uint32_t)k[5])<<8;
       ^~~~
hash.c:234:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 6 : b+=((uint32_t)k[5])<<8;
                ~^~~~~~~~~~~~~~~~~~~~~
hash.c:235:7: note: here
       case 5 : b+=k[4];
       ^~~~
hash.c:235:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 5 : b+=k[4];
                ~^~~~~~
hash.c:236:7: note: here
       case 4 : a+=((uint32_t)k[3])<<24;
       ^~~~
hash.c:236:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 4 : a+=((uint32_t)k[3])<<24;
                ~^~~~~~~~~~~~~~~~~~~~~~
hash.c:237:7: note: here
       case 3 : a+=((uint32_t)k[2])<<16;
       ^~~~
hash.c:237:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 3 : a+=((uint32_t)k[2])<<16; 

according to its solution, I deleted directory but it gave same errors.