diff --git a/src/ruby/ext/grpc/extconf.rb b/src/ruby/ext/grpc/extconf.rb
index 4760f33e389..33f3c816d68 100644
--- a/src/ruby/ext/grpc/extconf.rb
+++ b/src/ruby/ext/grpc/extconf.rb
@@ -15,31 +15,6 @@
 require 'etc'
 require 'mkmf'
 
-LIBDIR = RbConfig::CONFIG['libdir']
-INCLUDEDIR = RbConfig::CONFIG['includedir']
-
-HEADER_DIRS = [
-  # Search /opt/local (Mac source install)
-  '/opt/local/include',
-
-  # Search /usr/local (Source install)
-  '/usr/local/include',
-
-  # Check the ruby install locations
-  INCLUDEDIR
-]
-
-LIB_DIRS = [
-  # Search /opt/local (Mac source install)
-  '/opt/local/lib',
-
-  # Search /usr/local (Source install)
-  '/usr/local/lib',
-
-  # Check the ruby install locations
-  LIBDIR
-]
-
 windows = RUBY_PLATFORM =~ /mingw|mswin/
 bsd = RUBY_PLATFORM =~ /bsd/