how does linker choose version of shared lib?

[Paul Smith]

On Thu, 2011-04-28 at 09:57 -0700, Steve Jaffe wrote:
> To be specific: I have two versions of libssl in /lib: libssl.so.4 and
> libssl.so.6.  What happens is that the .so.4 version is always linked --
> what determines this behavior? (and how could one therefore change it, ie
> specify which version to choose?)

Typically there's a symbolic link on the system "libssl.so" (note no
version) which points to whichever major version you want to use as the
default.  This "un-versioned" .so is what's used by the compile-time
linker to determine which .so to link.

Look for libssl.so and see if it points to libssl.so.4 or libssl.so.6.