error: different size in shared object, consider re-linking?

[sneakyimp]

Someone is running some code I've written for them via CLI and getting an error I've never seen before. I don't think it has anything to do with the code I've written but I'd like to assist them with more information:

/web/cgi-bin/php5: Symbol `client_errors' has different size in shared object, consider re-linking
Content-type: text/html

What does that mean?

[johanafm]

I know precious little about compiling and linking but I'd guess a binary and a library were built using different compilers, since the compiler creates the objects which are then linked together using a linker.
In this case, it looks like dynamic linking of a shared library with the running process, or in other words: a php extension and the php process.

[sneakyimp]

Thanks for your response. That's more information than I had before.