Pretty astonishing

yarn add v1.22.10
[1/4] Resolving packages...
warning @rails/webpacker > node-sass > request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
warning @rails/webpacker > node-sass > node-gyp > request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
warning @rails/webpacker > node-sass > request > har-validator@5.1.5: this library is no longer supported
[2/4] Fetching packages...
info fsevents@1.2.13: The platform "linux" is incompatible with this module.
info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@2.3.1: The platform "linux" is incompatible with this module.
info "fsevents@2.3.1" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > webpack-dev-server@3.11.1" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
warning "webpack-dev-server > webpack-dev-middleware@3.7.3" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
[4/4] Building fresh packages...
error /tmp/hello_world/node_modules/node-sass: Command failed.
Exit code: 1
Command: node scripts/build.js
Arguments: 
Directory: /tmp/hello_world/node_modules/node-sass
Output:
Building: /usr/bin/node /tmp/hello_world/node_modules/node-gyp/bin/node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
gyp info it worked if it ends with ok
gyp verb cli [
gyp verb cli   '/usr/bin/node',
gyp verb cli   '/tmp/hello_world/node_modules/node-gyp/bin/node-gyp.js',
gyp verb cli   'rebuild',
gyp verb cli   '--verbose',
gyp verb cli   '--libsass_ext=',
gyp verb cli   '--libsass_cflags=',
gyp verb cli   '--libsass_ldflags=',
gyp verb cli   '--libsass_library='
gyp verb cli ]
gyp info using node-gyp@3.8.0
gyp info using node@15.5.1 | linux | x64
gyp verb command rebuild []
gyp verb command clean []
gyp verb clean removing "build" directory
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` failed Error: not found: python2
gyp verb `which` failed     at getNotFoundError (/tmp/hello_world/node_modules/which/which.js:13:12)
gyp verb `which` failed     at F (/tmp/hello_world/node_modules/which/which.js:68:19)
gyp verb `which` failed     at E (/tmp/hello_world/node_modules/which/which.js:80:29)
gyp verb `which` failed     at /tmp/hello_world/node_modules/which/which.js:89:16
gyp verb `which` failed     at /tmp/hello_world/node_modules/isexe/index.js:42:5
gyp verb `which` failed     at /tmp/hello_world/node_modules/isexe/mode.js:8:5
gyp verb `which` failed     at FSReqCallback.oncomplete (node:fs:199:21)
gyp verb `which` failed  python2 Error: not found: python2
gyp verb `which` failed     at getNotFoundError (/tmp/hello_world/node_modules/which/which.js:13:12)
gyp verb `which` failed     at F (/tmp/hello_world/node_modules/which/which.js:68:19)
gyp verb `which` failed     at E (/tmp/hello_world/node_modules/which/which.js:80:29)
gyp verb `which` failed     at /tmp/hello_world/node_modules/which/which.js:89:16
gyp verb `which` failed     at /tmp/hello_world/node_modules/isexe/index.js:42:5
gyp verb `which` failed     at /tmp/hello_world/node_modules/isexe/mode.js:8:5
gyp verb `which` failed     at FSReqCallback.oncomplete (node:fs:199:21) {
gyp verb `which` failed   code: 'ENOENT'
gyp verb `which` failed }
gyp verb check python checking for Python executable "python" in the PATH
gyp verb `which` succeeded python /usr/bin/python
gyp ERR! configure error 
gyp ERR! stack Error: Command failed: /usr/bin/python -c import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack   File "<string>", line 1
gyp ERR! stack     import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack                       ^
gyp ERR! stack SyntaxError: invalid syntax
gyp ERR! stack 
gyp ERR! stack     at ChildProcess.exithandler (node:child_process:333:12)
gyp ERR! stack     at ChildProcess.emit (node:events:376:20)
gyp ERR! stack     at maybeClose (node:internal/child_process:1063:16)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (node:internal/child_process:295:5)
gyp ERR! System Linux 5.10.4-arch2-1
gyp ERR! command "/usr/bin/node" "/tmp/hello_world/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /tmp/hello_world/node_modules/node-sass
gyp ERR! node -v v15.5.1
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok 
Build failed with error code: 1
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.