[Cialug] [OT] Compilation problem

[Kendall Bailey]

Depends on the way libjpeg.so is linked.  Here's an article that covers the
basics:

http://www.linux.org/docs/ldp/howto/Program-Library-HOWTO/shared-libraries.html

If each version of libjpeg has a distinct soname, then the trick is to get
the compilation/link steps to find (1) the header files for the version you
want to link to and (2) a symlink called libjpeg.so that points to the
libjpeg.so.X.Y you want to link to.

To find the soname of a shared object file you can use:

   objdump -x /usr/local/lib/libjpeg.so.62 | grep SONAME

I have no experience with building PHP so I don't know how hard it will be
to configure the build process to look for headers and library files in
non-standard locations.  I suspect the --with-jpeg-dir= option is for the
header files.  That dir probably needs an include/ folder with the headers
in it.  Perhaps it also could have a lib/ folder with the sym-link to actual
shared library you want to link to?  Otherwise perhaps there's another
config option for the link step.


Kendall


On Tue, Jun 29, 2010 at 9:45 AM, Daniel A. Ramaley <daniel.ramaley at drake.edu
> wrote:

> If multiple versions of a library are installed, is is possible to
> compile software against a specific version? If so, how?
>
> My specific situation is that a web server has 3 versions of libjpeg
> installed, 6.2, 7.0, and 8.0. I need to compile PHP against version 6.2,
> but it always finds the 8.0 version instead. All 3 versions are
> installed in /usr/local. I tried configuring PHP specifying the exact
> one using --with-jpeg-dir=/usr/local/lib/libjpeg.so.62, but it still
> ended up using the 8.0 version. Unfortunately, i can't just remove the
> newer versions as other running software is using it.
>
> --
> Daniel A. Ramaley
> Network Engineer 2
>
> Dial Center 118, Drake University
> 2407 Carpenter Ave / Des Moines IA 50311 USA
> Tel: +1 515 271-4540
> Fax: +1 515 271-1938
> E-mail: daniel.ramaley at drake.edu
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>
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