does not rebuild Makefile.in

[Ilya N. Golubev]

Version: 3.81

Occurs in any `Makefile' obtained from

Makefile.in generated by automake 1.10.1 from Makefile.am.

so reproducing should be easy.  `automake' args was:

 --gnu

All `Makefile' modification was removing `Makefile' target.  The
reason was obvious: otherwise `make' would fail due to `Makefile' not
remade.

Build and source directories were different.

Below, assuming that `srcdir' shell variable has the same value as in
`Makefile', so that can refer to it in shell commands.

Invoked:

rm -f "${srcdir}"/Makefile.in;make "${srcdir}"/Makefile.in

`make' invoked no commands to remake it.

This also means that, with unchanged `Makefile' generated
automatically, can not remake it.