a patch that fixes linkage problem?

gistfile1.diff

diff --git a/ruby/extconf.rb b/ruby/extconf.rb
index cda078f..2343ba6 100644
--- a/ruby/extconf.rb
+++ b/ruby/extconf.rb
@@ -45,6 +45,10 @@ EOF
 end
 
 
+unless find_library( "pthread", "pthread_create" )
+  error_exit error_lib_missing( "libpthread", "libc6-dev" )
+end
+
 unless find_library( "rt", "clock_gettime" )
   error_exit error_lib_missing( "librt", "libc6-dev" )
 end