Gentoo OpenNebula 5.10.1 ebuild development

When running scons for opennebula-5.10.1 release I have the following compile error

build_bison(["src/parsers/", "src/parsers/vm_file_var_syntax.h"], ["src/parsers/vm_file_var_syntax.y"])
build_bison(["src/parsers/", "src/parsers/vm_var_syntax.h"], ["src/parsers/vm_var_syntax.y"])
scons: *** [src/parsers/] src/parsers: No such file or directory
src/rm/ In member function 'void RequestManager::register_xml_methods()':
src/rm/ note: variable tracking size limit exceeded with -fvar-tracking-assignments, retrying without
 void RequestManager::register_xml_methods()
scons: building terminated because of errors.

The files that came with the provided archive are: expr_arith.y expr_bool.h expr_parser.l SConstruct template_parser.h template_syntax.y vm_file_var_syntax.h vm_var_parser.l
expr_arith.h expr_bool.y expr_parser.h template_parser.l template_syntax.h vm_file_var_syntax.y vm_var_parser.h vm_var_syntax.y

There is a vm_var_syntax.y but not a
Any hint about the problem?