Hello,
I am compiling Okular on Kubuntu. Compilation is ok. I set the KDEDIRS variable and after the "make install" command I see that folder populated. I edited the okular/generators/epub/converter.cpp file but even if I put, for example,

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return NULL;

at the very beginning of

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QTextDocument* Converter::convert( const QString &fileName )

class member, when I run the application I still get the epub loaded, so my modifications were ignored.
Note: when I run make it says it has compiled the epub generator so it compiles my modifications, just they have no effect (even if I run "sudo make install").
Can you help me? Thanks in advance.

If you want to start okular from your local installation you need to prepend the local install "bin" directory to $PATH, or manually specify it, like "~/install/bin/okular". Otherwise, you'll start the system-wide installation (see: "which okular").

Greetings

I am sorry but it doesn't work: the application starts with manually specified path as you say but my modifications have no effect. What check can I perform?

strace it and check where it reads stuff from. That's the most basic way, at least, there's probably easier ones.

Thank you.
According to strace it reads from the right places.
However if I type "okular" in the console terminal from the build directory the compiled app is called, so it is enough for me to test my modifications.

Read the last part of http://okular.kde.org/download.php