building amber from source macOS 10.14

amber-build.log

Building amber in /Users/conradwt/crystal.dir/projects/amber/bin/amber
Error in src/amber/cli.cr:5: while requiring "./cli/commands"

require "./cli/commands"
^

in src/amber/cli/commands.cr:4: while requiring "./templates/template"

require "./templates/template"
^

in src/amber/cli/templates/template.cr:4: while requiring "./app"

require "./app"
^

in src/amber/cli/templates/app.cr:3: expanding macro

    directory "#{__DIR__}/app"
    ^~~~~~~~~

in lib/teeplate/src/lib/file_tree/macros/directory.cr:52: instantiating 'String:Class#build()'

s = String.build do |sb|
           ^~~~~

in /opt/local/lib/crystal/string.cr:268: instantiating 'String::Builder:Class#build(Int32)'

    String::Builder.build(capacity) do |builder|
                    ^~~~~

in /opt/local/lib/crystal/string.cr:268: instantiating 'String::Builder:Class#build(Int32)'

    String::Builder.build(capacity) do |builder|
                    ^~~~~

in lib/teeplate/src/lib/file_tree/macros/directory.cr:52: instantiating 'String:Class#build()'

s = String.build do |sb|
           ^~~~~

in lib/teeplate/src/lib/file_tree/macros/directory.cr:57: instantiating 'pack_ecr(Int32, String::Builder, String, String)'

      pack_ecr i, sb, abs, $1
      ^~~~~~~~

in lib/teeplate/src/lib/file_tree/macros/directory.cr:33: undefined method 'stat' for File:Class

  ____files << ::Teeplate::StringData.new("#{rel}", io.to_s, #{File.stat(abs).perm})
                                                                    ^~~~


make: *** [/Users/conradwt/crystal.dir/projects/amber/bin/amber] Error 1