Error while installing with Yarn

[kentnek]

UPDATE:

Oh never mind, it turned out that pigpio hadn't been installed, which I thought was preinstalled by default. Just do a sudo apt-get install pigpio and you'll be fine.

---

I used yarn to install raspi-soft-pwm on a Pi 3 B (Raspbian Stretch) and encountered the following error:

error An unexpected error occurred: "/home/pi/node/test-rgb/node_modules/pigpio: Command failed.
Exit code: 1
Command: sh
Arguments: -c node-gyp rebuild
Directory: /home/pi/node/test-rgb/node_modules/pigpio
Output:
gyp info it worked if it ends with ok
gyp info using node-gyp@3.6.2
gyp info using node@9.11.1 | linux | arm
gyp info spawn /usr/bin/python2
gyp info spawn args [ '/home/pi/.nvm/versions/node/v9.11.1/lib/node_modules/npm/node_modules/node-gyp/gyp/gyp_main.py',
gyp info spawn args   'binding.gyp',
gyp info spawn args   '-f',
gyp info spawn args   'make',
gyp info spawn args   '-I',
gyp info spawn args   '/home/pi/node/test-rgb/node_modules/pigpio/build/config.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/home/pi/.nvm/versions/node/v9.11.1/lib/node_modules/npm/node_modules/node-gyp/addon.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/home/pi/.node-gyp/9.11.1/include/node/common.gypi',
gyp info spawn args   '-Dlibrary=shared_library',
gyp info spawn args   '-Dvisibility=default',
gyp info spawn args   '-Dnode_root_dir=/home/pi/.node-gyp/9.11.1',
gyp info spawn args   '-Dnode_gyp_dir=/home/pi/.nvm/versions/node/v9.11.1/lib/node_modules/npm/node_modules/node-gyp',
gyp info spawn args   '-Dnode_lib_file=/home/pi/.node-gyp/9.11.1/<(target_arch)/node.lib',
gyp info spawn args   '-Dmodule_root_dir=/home/pi/node/test-rgb/node_modules/pigpio',
gyp info spawn args   '-Dnode_engine=v8',
gyp info spawn args   '--depth=.',
gyp info spawn args   '--no-parallel',
gyp info spawn args   '--generator-output',
gyp info spawn args   'build',
gyp info spawn args   '-Goutput_dir=.' ]
gyp info spawn make
gyp info spawn args [ 'BUILDTYPE=Release', '-C', 'build' ]
make: Entering directory '/home/pi/node/test-rgb/node_modules/pigpio/build'
  CXX(target) Release/obj.target/pigpio/src/pigpio.o
../src/pigpio.cc:2:20: fatal error: pigpio.h: No such file or directory
 #include <pigpio.h>
                    ^
compilation terminated.
pigpio.target.mk:95: recipe for target 'Release/obj.target/pigpio/src/pigpio.o' failed
make: Leaving directory '/home/pi/node/test-rgb/node_modules/pigpio/build'
make: *** [Release/obj.target/pigpio/src/pigpio.o] Error 1
gyp ERR! build error
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/home/pi/.nvm/versions/node/v9.11.1/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:258:23)
gyp ERR! stack     at ChildProcess.emit (events.js:180:13)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:12)
gyp ERR! System Linux 4.9.59-v7+
gyp ERR! command \"/home/pi/.nvm/versions/node/v9.11.1/bin/node\" \"/home/pi/.nvm/versions/node/v9.11.1/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js\" \"rebuild\"
gyp ERR! cwd /home/pi/node/test-rgb/node_modules/pigpio
gyp ERR! node -v v9.11.1
gyp ERR! node-gyp -v v3.6.2

Any idea how to fix this? Thanks!