Unable to install from forked github repo using npm - reactjs

Question

I want to fork React Data Grid repo on Github, make some changes and install it in my react app.
I have added name, version, and description attributes in repo's package.json
I have tried to install it via
npm install username/repo_url#branch
It does install and build the package but is ignoring the dist and lib folder in node_modules/react-data-grid/packages/*/ and I am unable to import it in my code.
I have tried
1) commenting dist in my app's .gitignore
2) adding files attribute with dist in my app's package.json
Nothing works.
What am I doing wrong?
EDIT
Here is the stack trace after following #Derek Nguyen response
npm install piby180/react-data-grid#piby-current
> react-data-grid#1.0.0 postinstall C:\Users\Leo\Documents\Work\demos\myapp\node_modules\react-data-grid
> lerna bootstrap --no-ci && lerna run build
lerna notice cli v3.15.0
lerna info Bootstrapping 2 packages
lerna info Installing external dependencies
lerna info Symlinking packages and binaries
lerna success Bootstrapped 2 packages
lerna notice cli v3.15.0
lerna info Executing command in 2 packages: "npm run build"
lerna ERR! npm run build exited 1 in 'react-data-grid'
lerna ERR! npm run build stdout:
> react-data-grid#7.0.0-alpha.13 build C:\Users\Leo\Documents\Work\demos\myapp\node_modules\react-data-grid\packages\react-data-grid
> tsc
error TS6053: File 'C:/Users/Leo/Documents/Work/demos/myapp/node_modules/react-data-grid/packages/react-data-grid-addons/src/index.ts' not found.
error TS6053: File 'C:/Users/Leo/Documents/Work/demos/myapp/node_modules/react-data-grid/packages/react-data-grid/src/index.ts' not found.
Found 2 errors.
lerna ERR! npm run build stderr:
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! react-data-grid#7.0.0-alpha.13 build: `tsc`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react-data-grid#7.0.0-alpha.13 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Leo\AppData\Roaming\npm-cache\_logs\2019-07-17T14_35_42_219Z-debug.log
lerna ERR! npm run build exited 1 in 'react-data-grid'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.9 (node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.9 (node_modules\jest-haste-map\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! react-data-grid#1.0.0 postinstall: `lerna bootstrap --no-ci && lerna run build`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react-data-grid#1.0.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!

Answer 1

The 'postinstall' script in the package runs lerna bootstrap. According to the doc, it will then do the following:
When run, this command will:
npm install all external dependencies of each package.
Symlink together all Lerna packages that are dependencies of each other.
npm run prepublish in all bootstrapped packages (unless --ignore-prepublish is passed).
npm run prepare in all bootstrapped packages.
The packages in /packages don't have a prepare or prepublish script. You should be able to properly build the subpackage by modifying the root package.json's postinstall script:
postinstall": "lerna bootstrap --no-ci && lerna run build",
I think that should properly build the sub packages.