diff --git a/docs/Gemfile b/docs/Gemfile
index d5a2e01..90eb839 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -1,3 +1,10 @@
-source 'https://rubygems.org'
-gem 'github-pages', group: :jekyll_plugins
-#gem 'wdm', '>= 0.1.0' if Gem.win_platform?
+source "https://rubygems.org"
+
+# Manage our dependency on the version of the github-pages gem here.
+gem "github-pages", "= 228"
+
+# Explicitly include this gem here.
+# It is not directly included in the github-pages gem list of dependencies,
+# even though it is included in the original GitHub Pages build infrastructure.
+gem "jekyll-include-cache", "= 0.2.1"
+gem "jekyll-octicons", "~> 14.2"
diff --git a/include/_clang_include_prefix.hpp b/include/_clang_include_prefix.hpp
index a9728c8..c40af24 100644
--- a/include/_clang_include_prefix.hpp
+++ b/include/_clang_include_prefix.hpp
@@ -5,6 +5,8 @@
     #pragma clang diagnostic ignored "-Weverything"
 #elif __GNUC__ // must follow clang (which defines both)
     #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wdeprecated-enum-enum-conversion"
     #pragma GCC diagnostic ignored "-Wunknown-pragmas"
     #pragma GCC diagnostic ignored "-Wall"
+    #pragma GCC diagnostic ignored "-Wextra"
 #endif