Missing entries in .gitignore?

When building from a clean copy of the repository, some files appear as untracked:

• after running ./autogen.sh:
  • m4/libtool.m4
  • m4/lt~obsolete.m4
  • m4/ltoptions.m4
  • m4/ltsugar.m4
  • m4/ltversion.m4
  • stamp-h1
• after running make:
  • panel-plugin/xfce4-clipman-history