When I execute "./configure" on netopeer/server, I get the following error.

[ligang626]

checking if more special flags are required for pthreads... no
checking for PTHREAD_PRIO_INHERIT... yes
configure: generating validation files...
Traceback (most recent call last):
File "/usr/local/bin/lnctool", line 491, in
generate_validators(model_name+'.yin', augment_models_paths, args.search_path, args.feature)
File "/usr/local/bin/lnctool", line 105, in generate_validators
subprocess.check_call(['xsltproc', '--output', yin_file_name+'-config.rng', '--stringparam', 'basename', './'+os.path.basename(yin_file_name), '--stringparam', 'target', 'config', '--stringparam', 'schema-dir', RNGLIB, os.path.join(XSLTDIR, 'gen-relaxng.xsl'), os.path.abspath(dsdl_schema_name)])
File "/usr/lib/python2.7/subprocess.py", line 536, in check_call
retcode = call(*popenargs, **kwargs)
File "/usr/lib/python2.7/subprocess.py", line 523, in call
return Popen(*popenargs, **kwargs).wait()
File "/usr/lib/python2.7/subprocess.py", line 711, in init
errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
configure: error: Generating validation files for ietf-netconf-server failed.