Using X11 for an older program
macportsusers-20171215 at billmail.scconsult.com
Tue Dec 22 13:39:03 UTC 2020
On 21 Dec 2020, at 22:01, Michael wrote:
> OK. Next question: Is there any reason I cannot install libpng version
> 15 at the sametime?
Not really. Better to update the software that wants it to use a current
But the 1.5.x source is in the libpng site at Sourceforge, so you can
still get it, build it, and install the libraries where you need them
(/opt/X11/lib/)without affecting the v1.6.x version that MacPorts
> I am aware that there is a non-versioned link file, that the latest
> version of the dynamic library installs. That can stay at 16 where it
> belongs. I mean specifically having both the libpng15 and the libpng16
> I am very surprised at linking to a specific version of a dynamic
> library. This is actually commercial software, and it did not link to
> generic "libpng", nor to generic "libpng15" -- linking to a specific
> version of a dynamic library? Isn't the whole point of dynamic
> libraries that you don't get a single specific buggy version, but the
> latest non-buggy version?
Yes and no. Versioned libraries exist because sometimes you really don't
want to link to anything but the version that you built against.
Sometimes interfaces change between versions, particularly "major"
version changes such as in this case, and software using the library may
be known to not be forward-compatible.
Also see below...
> On 2020-12-21, at 6:55 PM, Ken Cunningham
> <ken.cunningham.webuse at gmail.com> wrote:
>>> On 2020-12-21, at 10:55 AM, Michael <keybounce at gmail.com> wrote:
>>> > This should be a simple one. I hope.
>>>> I just installed a program that was compiled against the release
>>>> version of mac's X11. Crashes on startup with this:
>>>> dyld: launch, loading dependent libraries
>>>> Dyld Error Message:
>>>> Library not loaded: /opt/X11/lib/libpng15.15.dylib
>>>> What symbolic links do I need? /opt has no X11 directory.
That's a bad sign, and a hint that you need to do more than just install
the right version of libpng.
The /opt/X11/ tree is where the "XQuartz" implementation of X11 installs
itself, along with a whole universe of its own required libraries. It
includes (in the last version, 2.7.11) 4 versions of libpng, with a
symlink for the unversioned name to libpng16.16.dylib. This implies
something of a mess in how the various binaries in the XQuartz package
were built, but you cannot fix that. You have a pre-built commercial
package that specifies at least one older version of a library as
installed by XQuartz so you can expect that it will also be dependent on
the whole collection of libraries installed by XQuartz.
If you lack /opt/X11/, you do not have XQuartz installed. Apple has not
included ANY X implementation in recent macOS versions, so you will need
to install XQuartz if you can't get a version of the failing software
built to use the X implementation that is installed by MacPorts.
bill at scconsult.com or billcole at apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
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