[Ifeffit] Problems running athena/tkatoms

[Matt Newville]

Hi Carlo,

> I think one of the problems with the Debian distribution is
> that there is no libpng.a (static).  There are libpng.so.2
> and libpng.so.3 but these seem to give problems in the linker
> as the -lpng option fails in both the PGPLOT_install script
> and the ifeffit make command.
>
> Is there a way to point to the shared object libraries instead?

Yes.  It shouldn't need a static library, as long as it can
find the shared one at 1) compile time, which is probably OK if
it's set with -L..., and 2) run time, which should work but
can s be painful.

I'd expect that what you're seeing is that PGPLOT (and ifeffit)
build OK  but that the executables don't run, saying:
 ~> ifeffit
   ifeffit: error while loading shared libraries: libpng.so:
            cannot load shared object file: No such file or
            directory

This probably means that libpng.so is in some location that the
run-time loader doesn't know about.

On linux, the 'ldd' command will show what shared libraries
an executable, or even another shared library will try to load,
and say which ones cannot be found.
  ~> ldd ifeffit
        libpng.so.2 => /usr/lib/libpng.so.2 (0x4002b000)
        libz.so.1 => /usr/lib/libz.so.1 (0x4004c000)
        libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x4005a000)
        ...

You can also run 'ldd libpgplot.so'. They should both point to
an existing libpng.so, otherwise it would say
        libpng.so.2 => not found