rpmvercmp > rpmEVRcmp, for unknown reason rpmvercmp not working in ruby

app/models/build_list.rb

@@ -394,7 +394,7 @@ class BuildList < ActiveRecord::Base
       source_packages.each do |nsp|
         sp = last_bl.source_packages.find{ |sp| nsp.name == sp.name }
         return true unless sp
-        comparison = nsp.rpmvercmp(sp)
+        comparison = nsp.rpmEVRcmp(sp)
         return true if comparison == 1
         return comparison == 0 && ( !save_to_platform.released? || save_to_platform.distrib_type == 'rhel' )
       end

app/models/build_list/package.rb

@@ -33,8 +33,8 @@ class BuildList::Package < ActiveRecord::Base
   # @param [BuildList::Package] other
   # @return [Number] -1 if +other+ is greater than, 0 if +other+ is equal to,
   #   and +1 if other is less than version.
-  def rpmvercmp(other)
-    RPM::C.rpmvercmp to_vre_epoch_zero, other.to_vre_epoch_zero
+  def rpmEVRcmp(other)
+    RPM::C.rpmEVRcmp to_vre_epoch_zero, other.to_vre_epoch_zero
   end
 
   def self.by_repository(repository, &block)

lib/plugins/rpm.rb

@@ -13,7 +13,7 @@ module RPM
       )
     end
 
-    attach_function 'rpmvercmp', [:string, :string], :int
+    attach_function 'rpmEVRcmp', [:string, :string], :int
 
   end
 end