private com.google.protobuf.SingleFieldBuilder<
          org.bwapi.proxy.messages.GameMessages.TechType, org.bwapi.proxy.messages.GameMessages.TechType.Builder, org.bwapi.proxy.messages.GameMessages.TechTypeOrBuilder> 
          getRequiredTechFieldBuilder() {
        if (requiredTechBuilder_ == null) {
          requiredTechBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              org.bwapi.proxy.messages.GameMessages.TechType, org.bwapi.proxy.messages.GameMessages.TechType.Builder, org.bwapi.proxy.messages.GameMessages.TechTypeOrBuilder>(
                  requiredTech_,
                  getParentForChildren(),
                  isClean());
          requiredTech_ = null;
        }
        return requiredTechBuilder_;
      }