Per Atom text editor build instructions for freeBSD:

pkg install node
pkg install npm
pkg install libgnome-keyring
npm config set python /usr/local/bin/python2 -g

Then:

git clone https://github.com/atom/atom
cd atom
script/build

This is on a vbox guest with Guest Additions using FreeBSD-11.1-RELEASE-amd64-disc1.iso that runs Gnome 3.18.2. Win 10 host.

When I:

script/build

I get:

  Node: v8.8.1
  Npm:  v5.3.0
  Installing script dependencies
  prebuild-install info begin Prebuild-install version 2.3.0
  prebuild-install info looking for local prebuild @ prebuilds/leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install info looking for cached prebuild @ ~/.npm/_prebuilds/https-github.com-level-leveldown-releases-download-v1.9.0-leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install http request GET https://github.com/level/leveldown/releases/download/v1.9.0/leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install http 404 https://github.com/level/leveldown/releases/download/v1.9.0/leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install WARN install No prebuilt binaries found (target=8.8.1 runtime=node arch=x64 platform=freebsd)
  In file included from ../deps/leveldb/leveldb-1.20/db/builder.cc:5:
  In file included from ../deps/leveldb/leveldb-1.20/db/builder.h:8:
  In file included from ../deps/leveldb/leveldb-1.20/include/leveldb/status.h:16:
  In file included from /usr/include/c++/v1/string:469:
  /usr/include/c++/v1/__config:73:2: error: "_LIBCPP_TRIVIAL_PAIR_COPY_CTOR" is no longer supported.        use _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR instead
  #error "_LIBCPP_TRIVIAL_PAIR_COPY_CTOR" is no longer supported. \
   ^
  1 error generated.
  gmake: *** [deps/leveldb/leveldb.target.mk:150: Release/obj.target/leveldb/deps/leveldb/leveldb-1.20/db/builder.o] Error 1
  gyp ERR! build error 
  gyp ERR! stack Error: `gmake` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (~/atom/script/node_modules/npm/node_modules/node-gyp/lib/build.js:258:23)
  gyp ERR! stack     at emitTwo (events.js:125:13)
  gyp ERR! stack     at ChildProcess.emit (events.js:213:7)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
  gyp ERR! System FreeBSD 11.1-RELEASE
  gyp ERR! command "/usr/local/bin/node" "~/atom/script/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
  gyp ERR! cwd ~/atom/script/node_modules/electron-link/node_modules/leveldown
  gyp ERR! node -v v8.8.1
  gyp ERR! node-gyp -v v3.6.2
  gyp ERR! not ok 
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! leveldown@1.9.0 install: `prebuild-install || node-gyp rebuild`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the leveldown@1.9.0 install 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!     ~/.npm/_logs/2017-11-09T22_00_42_308Z-debug.log
  child_process.js:621
   throw err;
   ^

  Error: Command failed: ~/atom/script/node_modules/.bin/npm --loglevel=error install
  prebuild-install info begin Prebuild-install version 2.3.0
  prebuild-install info looking for local prebuild @ prebuilds/leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install info looking for cached prebuild @ ~/.npm/_prebuilds/https-github.com-level-leveldown-releases-download-v1.9.0-leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install http request GET https://github.com/level/leveldown/releases/download/v1.9.0/leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install http 404 https://github.com/level/leveldown/releases/download/v1.9.0/leveldown-v1.9.0-node-v57-freebsd-x64.tar.gz
  prebuild-install WARN install No prebuilt binaries found (target=8.8.1 runtime=node arch=x64 platform=freebsd)
  In file included from ../deps/leveldb/leveldb-1.20/db/builder.cc:5:
  In file included from ../deps/leveldb/leveldb-1.20/db/builder.h:8:
  In file included from ../deps/leveldb/leveldb-1.20/include/leveldb/status.h:16:
  In file included from /usr/include/c++/v1/string:469:
  /usr/include/c++/v1/__config:73:2: error: "_LIBCPP_TRIVIAL_PAIR_COPY_CTOR" is no longer supported.        use _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR instead
  #error "_LIBCPP_TRIVIAL_PAIR_COPY_CTOR" is no longer supported. \
   ^
  1 error generated.
  gmake: *** [deps/leveldb/leveldb.target.mk:150: Release/obj.target/leveldb/deps/leveldb/leveldb-1.20/db/builder.o] Error 1
  gyp ERR! build error 
  gyp ERR! stack Error: `gmake` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (~/atom/script/node_modules/npm/node_modules/node-gyp/lib/build.js:258:23)
  gyp ERR! stack     at emitTwo (events.js:125:13)
  gyp ERR! stack     at ChildProcess.emit (events.js:213:7)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
  gyp ERR! System FreeBSD 11.1-RELEASE
  gyp ERR! command "/usr/local/bin/node" "~/atom/script/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
  gyp ERR! cwd ~/atom/script/node_modules/electron-link/node_modules/leveldown
  gyp ERR! node -v v8.8.1
  gyp ERR! node-gyp -v v3.6.2
  gyp ERR! not ok 
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! leveldown@1.9.0 install: `prebuild-install || node-gyp rebuild`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the leveldown@1.9.0 install 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!     ~/.npm/_logs/2017-11-09T22_00_42_308Z-debug.log

   at checkExecSyncError (child_process.js:598:13)
at Object.execFileSync (child_process.js:618:13)
at module.exports (~/atom/script/lib/install-script-dependencies.js:9:16)
at Object.<anonymous> (~/atom/script/bootstrap:28:1)
at Module._compile (module.js:612:30)
at Object.Module._extensions..js (module.js:623:10)
at Module.load (module.js:531:32)
at tryModuleLoad (module.js:494:12)
at Function.Module._load (module.js:486:3)
at Module.require (module.js:556:17)

The error log :

~/.npm/_logs/2017-11-09T22_00_42_308Z-debug.log

I figured I would start at what I imagined as the top and tried:

npm install leveldown

No luck.

I tried:

npm install leveldown --llvm-version=5.0

That worked per Level/leveldown/fails to build on freebsd 11.1 #390

However, Atom still doesn't build … same output. Perhaps this has already been addressed somewhere else but I have not had a chance to see it.

While this wasn't a port a party there is a port bug as mentioned at lovell/sharp/Cannot build for FreeBSD 11, _LIBCPP_TRIVIAL_PAIR_COPY_CTOR is no longer supported #873

I ran across atom/atom/Atom fails to build on FreeBSD 11.0 x86_32 #6035 but I am not literate enough to parse if the issues are similar enough. I don't see them as explicitly similar enough.

I am imagining that leveldown is the 1st error. Following that imagination I am guessing that leveldb is the next error merely by the order of the output. I haven't stumbled close enough to leveldb yet.

I tried:

npm install ~/atom/script leveldown --llvm-version=5.0

Still nothing.

leveldown-prebuilt

Worse. Erred faster.

Is Atom not working to build on freeBSD? Am I following the right path to sort out the errors? I noticed the output refs leveldown v. 1.9.

atom/script/package.json

says:

"leveldown": "^2.0.0",

but leveldown seems to be on v. 1.5. I don't see that as making much difference but who am I to say …?

How do I proceed from here to build and run Atom on freeBSD-11.1?

Thank you for your comments, assistance, and patience.