okay, nothing works, but i won't push this branch anyway.

www-apps/gitlabhq/files/gitlabhq-8.1.0_rc1-fix-gemfile.patch

@@ -0,0 +1,56 @@
+diff --git a/Gemfile b/Gemfile
+index 9254ce2..94acb3d 100644
+--- a/Gemfile
++++ b/Gemfile
+@@ -174,6 +174,9 @@ gem "underscore-rails", "~> 1.4.4"
+ # Sanitize user input
+ gem "sanitize", '~> 2.0'
+ 
++# The newer revision of charlock_holmes that is finally fixed to be compatible with Gentoo
++gem "charlock_holmes", git: "https://github.com/brianmario/charlock_holmes.git", ref: "dde194609b3513b0d2369ce8f916ae52566154b4"
++
+ # Protect against bruteforcing
+ gem "rack-attack", '~> 4.3.0'
+ 
+@@ -183,9 +186,6 @@ gem 'ace-rails-ap', '~> 2.0.1'
+ # Keyboard shortcuts
+ gem 'mousetrap-rails', '~> 1.4.6'
+ 
+-# Detect and convert string character encoding
+-gem 'charlock_holmes', '~> 0.6.9.4'
+-
+ gem "sass-rails", '~> 4.0.5'
+ gem "coffee-rails", '~> 4.1.0'
+ gem "uglifier", '~> 2.7.2'
+diff --git a/Gemfile.lock b/Gemfile.lock
+index 5312289..586bd90 100644
+--- a/Gemfile.lock
++++ b/Gemfile.lock
+@@ -1,3 +1,10 @@
++GIT
++  remote: https://github.com/brianmario/charlock_holmes.git
++  revision: dde194609b3513b0d2369ce8f916ae52566154b4
++  ref: dde194609b3513b0d2369ce8f916ae52566154b4
++  specs:
++    charlock_holmes (0.6.9.4)
++
+ GEM
+   remote: https://rubygems.org/
+   specs:
+@@ -108,7 +115,6 @@ GEM
+       json (>= 1.7)
+     celluloid (0.16.0)
+       timers (~> 4.0.0)
+-    charlock_holmes (0.6.9.4)
+     chunky_png (1.3.4)
+     cliver (0.3.2)
+     coderay (1.1.0)
+@@ -800,7 +806,7 @@ DEPENDENCIES
+   capybara (~> 2.4.0)
+   capybara-screenshot (~> 1.0.0)
+   carrierwave (~> 0.9.0)
+-  charlock_holmes (~> 0.6.9.4)
++  charlock_holmes!
+   coffee-rails (~> 4.1.0)
+   colored (~> 1.2)
+   colorize (~> 0.5.8)