docs: def build(self):
          """
          Build package from source and create log
          file in path /var/log/slpkg/sbo/build_logs/.
          Also check md5sum calculates.
          """
          try:
              self._delete_dir()
              try:
                  tar = tarfile.open(self.script)
              except Exception as err:
                  print err
                  raise SystemExit()
              tar.extractall()
              tar.close()
              self._makeflags()
              self._delete_sbo_tar_gz()
              self._create_md5_dict()
              if not self.auto:
                  os.chdir(self._SOURCES)
              for src in self.sources:
                  if not os.path.isfile(src):
                      continue
                  # fix build sources with spaces
                  src = src.replace("%20", " ")
                  check_md5(self.sbo_md5[src], src)
                  # copy source and fix passing char '+' from file name
                  shutil.copy2(src.replace("%2B", "+"), self.path + self.prgnam)
              os.chdir(self.path + self.prgnam)
              # change permissions
              subprocess.call("chmod +x {0}.SlackBuild".format(self.prgnam),
                              shell=True)
              pass_var = self._pass_variable()
              if self.meta.sbo_build_log in ["on", "ON"]:
                  if os.path.isfile(self.build_logs + self.log_file):
                      os.remove(self.build_logs + self.log_file)
                  # start log write
                  log_head(self.build_logs, self.log_file, self.start_log_time)
                  subprocess.Popen("{0} ./{1}.SlackBuild 2>&1 | tee -a "
                                   "{2}{3}".format(" ".join(pass_var),
                                                   self.prgnam, self.build_logs,
                                                   self.log_file), shell=True,
                                   stdout=sys.stdout).communicate()
                  sum_time = build_time(self.start_time)
                  # write end in log file
                  log_end(self.build_logs, self.log_file, sum_time)
                  print("Total build time for the package {0} : {1}\n".format(
                      self.prgnam, sum_time))
              else:
                  subprocess.call("{0} ./{1}.SlackBuild".format(
                      " ".join(pass_var), self.prgnam), shell=True)
              os.chdir(self.path)
          except KeyboardInterrupt:   # (OSError, IOError):
              self.msg.pkg_not_found("\n", self.prgnam, "Wrong file", "\n")