install-watchman-ubuntu.sh

sudo apt install -y autoconf automake build-essential python-dev libtool libssl-dev pkg-config

cd /tmp
git clone https://github.com/facebook/watchman.git -b v4.9.0 --depth 1
cd watchman/
./autogen.sh 
./configure --enable-lenient
make
sudo make install

I arrived here searching on the error @mnpenner had https://gist.github.com/markis/705f101a549f958d62546fb966caae42#gistcomment-2276955

What corrected that error for me on Ubuntu 16.04 was running ./configure again after installing libssl-dev

Try ./configure --enable-lenientinstead of./configure.

It worked perfectly for me.

FYI I also had to sudo apt-get install libcrypto++-dev to get around the following build errors on 18.04 using v4.9.0:

ContentHash.cpp:65: undefined reference to `SHA1_Init'
ContentHash.cpp:78: undefined reference to `SHA1_Update'
ContentHash.cpp:81: undefined reference to `SHA1_Final'

I am using Ubuntu 18.04,
getting error after make command.

error screen is

gd@gd10:/tmp/watchman$ make
make  all-am
make[1]: Entering directory '/tmp/watchman'
  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;
                ~^~~~~~~~~~~~~~~~~~~~~~
hash.c:238:7: note: here
       case 2 : a+=((uint32_t)k[1])<<8;
       ^~~~
hash.c:238:17: error: this statement may fall through [-Werror=implicit-fallthrough=]
       case 2 : a+=((uint32_t)k[1])<<8;
                ~^~~~~~~~~~~~~~~~~~~~~
hash.c:239:7: note: here
       case 1 : a+=k[0];
       ^~~~
cc1: all warnings being treated as errors
Makefile:2313: recipe for target 'watchman-hash.o' failed
make[1]: *** [watchman-hash.o] Error 1
make[1]: Leaving directory '/tmp/watchman'
Makefile:868: recipe for target 'all' failed
make: *** [all] Error 2
gd@gd10:/tmp/watchman$```

I install with master branch, and worked perfectly for me.

Thanks for this man! 🥇

How do you test if watchman works?

How do I correct this error found after running the sudo apt-get install -y autoconf automake build-essential python-dev libtool libssl-dev command

The following packages have unmet dependencies:
python-dev : Depends: python (= 2.7.11-1) but 2.7.12-116.04 is to be installed
Depends: libpython-dev (= 2.7.11-1) but it is not going to be installed
Depends: python2.7-dev (>= 2.7.11-1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

These steps worked for me on Ubuntu 18.4 (note I had to install the pkg-config package):

sudo apt install -y autoconf automake build-essential python-dev libtool libssl-dev pkg-config
cd /tmp
git clone https://github.com/facebook/watchman.git
cd watchman/
git checkout v4.9.0
./autogen.sh 
./configure 
make
sudo make install

thank you

ditto on 18.04 pkg-config is also needed

./configure --enable-lenient

it worked for https://gist.github.com/markis/705f101a549f958d62546fb966caae42#gistcomment-2222957

These steps worked for me on Ubuntu 18.4 (note I had to install the pkg-config package):

sudo apt install -y autoconf automake build-essential python-dev libtool libssl-dev pkg-config
cd /tmp
git clone https://github.com/facebook/watchman.git
cd watchman/
git checkout v4.9.0
./autogen.sh 
./configure 
make
sudo make install

Working! thx!!

./configure --without-python --without-pcre --enable-lenient

did the trick on 19.04

I updated the script with all the comments mentioned here, ie. pkg-config and --enable-lenient

Another way more easiest is sudo apt install watchman