+diff -ruN ecasound-2.9.1.orig/configure.ac ecasound-2.9.1/configure.ac
+--- ecasound-2.9.1.orig/configure.ac 2014-01-03 11:34:07.000000000 +0100
++++ ecasound-2.9.1/configure.ac 2017-02-25 23:46:30.167878523 +0100
+@@ -749,7 +749,7 @@
+ rubyecasound_support=no
+ ECA_S_RUBY_SITEDIR=""
+ else
+- ECA_S_RUBY_SITEDIR="`ruby -e 'require "rbconfig"; include Config; print CONFIG[["sitedir"]] + "/" + CONFIG[["MAJOR"]] + "." + CONFIG[["MINOR"]]'`"
++ ECA_S_RUBY_SITEDIR="`ruby -rrbconfig -e 'print RbConfig::CONFIG[["vendordir"]]'`"
+ fi
+
+ AC_SUBST(ECA_S_RUBY_SITEDIR)