How to move aminfo-results (PDF/HTML) from clean-aminfo to maintainer-clean-aminfo?

[Simon Sobisch]

   GnuCOBOL includes the manual in both info and PDF formats in its
   tarballs, but the PDF is removed on `make clean`.

   This is the main part of doc/Makefile.am:

   _________________________________________

   info_TEXINFOS = gnucobol.texi
   gnucobol_TEXINFOS = fdl.texi
   EXTRA_DIST = gnucobol.pdf
   AM_MAKEINFOHTMLFLAGS = --no-headers --no-split
   CLEANFILES = *.aux  *.cp *.fn *.ky *.log *.pg *.toc *.tp *.vr *.vrs
   TEXI2DVI = texi2dvi -I $(srcdir)
   _________________________________________

   This is the current behavior:

   * `make dist`    creates .info and .pdf, both are included in the
   tarball
   * `make clean`   removes .pdf
   * `make maintainer-clean`   removes .info

   Therefore the purpose of EXTRA_DIST "the user doesn't need to have the
   tools installed to create the file"
   only works as long as he doesn't call `make clean`.

   I've checked the generated Makefile.in and indeed it has

   clean-aminfo:
       -test -z "gnucobol.dvi gnucobol.pdf gnucobol.ps gnucobol.html" \
       || rm -rf gnucobol.dvi


   Is there an option to move gnucobol.pdf (and ideally gnucobol.html,
   too) from clean-aminfo to maintainer-clean-aminfo?

   Thank you for providing helpful notes,
   Simon