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

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