Re: [gentoo-dev] Opera 6.0 final.

[Avi Schwartz <avi@CFFtechnologies.com>]

I figured the problem out and I posted a message about a solution in
gentoo-user.  The problem I had was not with Opera but rather with QT2. 
Here is the message which was titled "QT dependencies problem":

While investigating the reason for problems I had with Opera 6.0 final,
I found what my problem was and it had to do with multiple libpng
versions.

Apparently, on my system, qt-2.3.2-r1 was built when only libpng-1.2.1
was installed thus requiring libpng.so.3.

Opera was built using libqt 2.x and libpng.so.2 which corresponds with
libpng-1.0.12.

Because of the different versions of libpng used by Opera and one of its
dynamically loaded libraries (QT) it would seg fault.

Since Opera is available only as a binary, to fix it, I unmerged
libpng-1.2.1-r1, reemerged qt-2.3.2-r1 so it used the 1.0.12 version of
libpng, and then reemerged libpng to bring version 1.2.1 back to life.

Now the question:  should the dependency of qt-2 be changed so it
requires libpng-1.0.12 rather then the generic dependency on
media-libs/libpng and the ebuild modified to use the proper libpng
version?

I haven't filed a bug report since I am not sure if the problem is with
the ebuild, with Opera, or something else altogether.

Avi


On Mon, 2002-05-20 at 01:54, Arcady Genkin wrote:
> Avi Schwartz <avi@CFFtechnologies.com> writes:
> 
> > opera: error while loading shared libraries: libpng.so.3: cannot open
> > shared object file: No such file or directory
> >
> > With only version 1.2.1-r1 of libpng installed:
> >
> > opera: error while loading shared libraries: libpng.so.2: cannot open
> > shared object file: No such file or directory
> 
> I could reproduce this.
> 
> > With both versions 1.0.12-r1 and 1.2.1-r1 of libpng installed:
> >
> > libpng warning: Application was compiled with png.h from libpng-1.2.1
> > libpng warning: Application  is running with png.c from libpng-1.0.12
> > libpng error: Incompatible libpng version in application and library
> > Segmentation fault
> 
> Strangely, I was not seeing this.  On my system I had both versions of
> libpng installed (by oversight) and that's why the ebuild worked for
> me.  Looks like opera 6.0 is a mess as far as libpng dependency
> goes...
-- 
Avi Schwartz
avi@CFFtechnologies.com