Could you add an ebuild for Google's Dart SDK https://www.dartlang.org/tools/sdk/?
Here are build instructions: https://code.google.com/p/dart/wiki/Building
Created attachment 399428 [details] eclass/gyp-utils.eclass
Created attachment 399430 [details] dev-util/gyp
Created attachment 399432 [details] dev-lang/dart
Created attachment 399434 [details, diff] dev-lang/dart/files
Requires further testing. Compiles and installs.
Created attachment 399438 [details] dev-lang/dart I forgot to add the dependencies.
Created attachment 399664 [details] Candidate ebuild Please consider the attached ebuild, which is based on the hermetic source tarball we use for our Debian packages. Additionally it supports ARM, ARM64, and MIPS. Tested cross-building all targets from an X64 host.
Created attachment 405528 [details] dart-1.10.1.ebuild
Created attachment 411216 [details] dart-1.12.0.ebuild
dart-1.13.0.ebuild is uploaded on https://github.com/mausys/portage.git