Working fine for me on Linux Mint, same grunt/grunt-cli version. My node version is older but that probably shouldn't matter.

Maybe there's something wrong with your sass installation. Old or incompatible version.

Sass 3.4.21 and for you?

This fails because stylesheets/_intlTelInput.scss is in fact a symbolic link to ../components/intl-tel-input/build/css/intlTelInput.css. Not sure how symlinks can be made to work on Windows?

As a workaround you could just copy the contents of the linked file to stylesheets/_intlTelInput.scss

The linux world symlinks don't work for windows and if needed you would have to create them new.
(LSE wrosk great)

See also #293 (comment)

I copy file into steelsheet and it works, Thinks

Workaround or not, this is still an issue on Windows. Is there any way to make this build cross-platform?

Could this get an actual solution? I mean it shouldn't be that hard to just change the script to just copy those 2 files.

Running "concat:libtextsecuretest" (concat) task
File libtextsecure/test/test.js created.

Running "sass:stylesheets" (sass) task
Error: Invalid CSS after "...ntlTelInput.css": expected "{", was ""
        on line 1 of stylesheets/_intlTelInput.scss
        from line 2 of stylesheets/options.scss
  Use --trace for backtrace.
Warning: Exited with error code 13 Use --force to continue.

Aborted due to warnings.
Error: Invalid CSS after ".../demo/emoji.css": expected "{", was ""
        on line 1 of stylesheets/_emoji.scss
        from line 13 of stylesheets/manifest.scss
  Use --trace for backtrace.

@luckcolors Would you like to write a PR for it?

I'm not so fond on javascript unfortunately. But i'll see what i can do.

Also can you please reopen the issue? :)