UNIX and Linux Applications

Is there any open-source software that OCRs PDFs?

check if this or this is what you want

or maybe this

I had downloaded Tesseract earlier, but it had a few problems:
* It wouldn't compile (./configure gave C++ errors).
* It doesn't work on pdf files, only tiffs.
* It doesn't work on files with multiple columns
* It doesn't deskew, despeckle, or do other cleanup needed to get sensible output.

I downloaded OCRopus to try to get around some of the limitations, but without being able to compile Tesseract of course that's all for naught.

Code:

checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for cl.exe... no
checking for g++... no
checking for C++ compiler default output file name... configure: error: C++ compiler cannot create executables
See `config.log' for more details.