Using X11 for an older program

[Ken Cunningham]

A thought — perhaps you might just take the easy road, and install the libraries it is looking for, in /opt/X11

what is that, XQuartz? 

K

> On Dec 21, 2020, at 7:01 PM, Michael <keybounce at gmail.com> wrote:
> 
> OK. Next question: Is there any reason I cannot install libpng version 15 at the sametime?
> 
> 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 files.
> 
> 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?
> 
> 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. 
>>> Ok, another question. I found this: /opt/local/lib/libpng16.16.dylib I cannot find the older version. What do I need to do to install both the current and the older version of this library at the same time? 
>> 
>> There are likely to be more libraries missing after you fix this one, but you can try.
>> 
>> EIther symlink a real library that is the same or as similar as you have into the position being looked for:
>> 
>> sudo ln -s /opt/local/lib/libpng16.16.dylib /opt/X11/lib/libpng15.15.dylib
>> 
>> or
>> 
>> use install_name_tool to change /opt/local/lib/libpng16.16.dylib to /opt/X11/lib/libpng15.15.dylib in your binary.
>> 
>> install_name_tool -change  /opt/local/lib/libpng16.16.dylib /opt/X11/lib/libpng15.15.dylib /path/to/my/binary
>> 
>> 
>> You can see that there are many many ways this could break / not work at all. 
>> 
>> But it sometimes works, if you’re lucky, and the libraries are very close to what is being looked for.
>> 
>> K
> 
> ---
> This message was composed with the aid of a laptop cat, and no mouse
>