diff --git a/build_config.rb b/build_config.rb
index b343bcc..bc5f69d 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -4,6 +4,8 @@ DEST_DIR = File.join(ROOT_DIR, 'dest').freeze
 MRuby::CrossBuild.new 'mrubyvisor' do |conf|
   conf.toolchain :gcc
 
+  conf.gem core: 'mruby-eval'
+
   conf.cc.defines   <<
     'MRB_NO_BOXING' <<
     'MRB_NO_FLOAT'  <<
diff --git a/vendor/libkernaux b/vendor/libkernaux
index 5ea65b6..91bce08 160000
--- a/vendor/libkernaux
+++ b/vendor/libkernaux
@@ -1 +1 @@
-Subproject commit 5ea65b6b0c686d9537c92e0fd240620ad3cc7996
+Subproject commit 91bce08aa3161c1708580c69345eee298e9af457