% yarn
yarn install v1.22.10
info No lockfile found.
[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
warning @rails/webpacker > webpack > watchpack > watchpack-chokidar2 > chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
warning @rails/webpacker > webpack > watchpack > watchpack-chokidar2 > chokidar > fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
warning @rails/webpacker > webpack > micromatch > snapdragon > source-map-resolve > resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
warning @rails/webpacker > webpack > micromatch > snapdragon > source-map-resolve > urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
warning webpack-dev-server > chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
warning " > webpack-dev-server@3.11.0" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
warning "webpack-dev-server > webpack-dev-middleware@3.7.2" has unmet peer dependency "webpack@^4.0.0".
[4/4] 🔨  Building fresh packages...
[1/3] ⠠ fsevents
[-/3] ⠠ waiting...
error /Users/cw/project/CW-OVP/node_modules/node-sass: Command failed.
Exit code: 1
Command: node scripts/build.js
Arguments: 
Directory: /Users/cw/project/CW-OVP/node_modules/node-sass
Output:
Building: /usr/local/Cellar/node/15.2.1/bin/node /Users/cw/project/CW-OVP/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/local/Cellar/node/15.2.1/bin/node',
gyp verb cli   '/Users/cw/project/CW-OVP/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@15.2.1 | darwin | 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 "/usr/bin/python" in the PATH
gyp verb `which` succeeded /usr/bin/python /usr/bin/python
gyp verb check python version `/usr/bin/python -c "import sys; print "2.7.16
gyp verb check python version .%s.%s" % sys.version_info[:3];"` returned: %j
gyp verb get node dir no --target version specified, falling back to host node version: 15.2.1
gyp verb command install [ '15.2.1' ]
gyp verb install input version string "15.2.1"
gyp verb install installing version: 15.2.1
gyp verb install --ensure was passed, so won't reinstall if already installed
gyp verb install version is already installed, need to check "installVersion"
gyp verb got "installVersion" 9
gyp verb needs "installVersion" 9
gyp verb install version is good
gyp verb get node dir target node version installed: 15.2.1
gyp verb build dir attempting to create "build" dir: /Users/cw/project/CW-OVP/node_modules/node-sass/build
gyp verb build dir "build" dir needed to be created? /Users/cw/project/CW-OVP/node_modules/node-sass/build
gyp verb build/config.gypi creating config file
gyp verb build/config.gypi writing out config file: /Users/cw/project/CW-OVP/node_modules/node-sass/build/config.gypi
gyp verb config.gypi checking for gypi file: /Users/cw/project/CW-OVP/node_modules/node-sass/config.gypi
gyp verb common.gypi checking for gypi file: /Users/cw/project/CW-OVP/node_modules/node-sass/common.gypi
gyp verb gyp gyp format was not specified; forcing "make"
gyp info spawn /usr/bin/python
gyp info spawn args [
gyp info spawn args   '/Users/cw/project/CW-OVP/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   '/Users/cw/project/CW-OVP/node_modules/node-sass/build/config.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/Users/cw/project/CW-OVP/node_modules/node-gyp/addon.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/Users/cw/.node-gyp/15.2.1/include/node/common.gypi',
gyp info spawn args   '-Dlibrary=shared_library',
gyp info spawn args   '-Dvisibility=default',
gyp info spawn args   '-Dnode_root_dir=/Users/cw/.node-gyp/15.2.1',
gyp info spawn args   '-Dnode_gyp_dir=/Users/cw/project/CW-OVP/node_modules/node-gyp',
gyp info spawn args   '-Dnode_lib_file=/Users/cw/.node-gyp/15.2.1/<(target_arch)/node.lib',
gyp info spawn args   '-Dmodule_root_dir=/Users/cw/project/CW-OVP/node_modules/node-sass',
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 args ]
No receipt for 'com.apple.pkg.CLTools_Executables' found at '/'.

No receipt for 'com.apple.pkg.DeveloperToolsCLILeo' found at '/'.

No receipt for 'com.apple.pkg.DeveloperToolsCLI' found at '/'.

gyp: No Xcode or CLT version detected!
gyp ERR! configure error 
gyp ERR! stack Error: `gyp` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onCpExit (/Users/cw/project/CW-OVP/node_modules/node-gyp/lib/configure.js:345:16)
gyp ERR! stack     at ChildProcess.emit (node:events:329:20)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (node:internal/child_process:277:12)
gyp ERR! System Darwin 19.6.0
gyp ERR! command "/usr/local/Cellar/node/15.2.1/bin/node" "/Users/cw/project/CW-OVP/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /Users/cw/project/CW-OVP/node_modules/node-sass
gyp ERR! node -v v15.2.1
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok 

% sudo xcode-select --reset