Using xdelta: header file not found. c++ - c++

Question

I am trying to maintain file history on a server from a client and I have thought of using xdelta for it. There is almost no help online for using xdelta. I gathered a few bits and pieces of code and tried to run it in order to understand it myself but the compiler gives the following error:
fatal error: xdelta3.h: No such file or directory
I have installed xdelta3 using apt-get as well as by downloading .tar from the website.
Here's the header files I included:
#include <xdelta3.h>
#include <xdelta3-main.h>
Any ideas as to what the header files for xdelta are? It will be appreciated if you could also provide some links for learning how to use xdelta since the documentation is insufficient for me.

Answer 1

First of all, be sure that you have -dev package installed as well. On my Debian system I did:
$ sudo apt-get install libxdelta2-dev
Now you should be able to use those xdelta headers. But they can have different naming than you use. You can check it this way:
$ dpkg -L libxdelta2-dev | grep include
For me shows:
/usr/include/edsio_edsio.h
/usr/include/edsio.h
/usr/include/xd_edsio.h
/usr/include/xdelta.h
So you can see that in this case I should use xdelta.h header, no xdelta3.h. Try the same dpkg -L command with your -dev package.
If you have different version of xdelta*-dev package, check output of this command:
pkg-config --list-all | grep delta
For me output is empty, but if you have something like libxdelta in output, be sure to compile your application with these options:
$ gcc $(pkg-config --cflags --libs libxdelta) main.c
UPDATE 1
As for the linking issue you have. I guess you are using gcc, so it automatically uses correct linker for you. The thing is, you should provide library name, which you want to link your program with, as a linker option.
First you should figure out your actual library name:
$ ls -1 /usr/lib | grep xdelta | grep so
You will see something like this:
libxdelta.so
libxdelta.so.2
libxdelta.so.2.0.0
Now you know your library name: it's part of library file name between lib and .so, in this case library name is xdelta.
Now you can link your program with it, using -l option:
$ gcc -lxdelta main.c
You may be also needed to specify path to xdelta library, if it's not a standard one (like /usr/lib/):
$ gcc -L/your/path/to/xdelta/ -lxdelta main.c
UPDATE 2
How to build and use xdelta3.
Obtain sources:
cd /tmp
wget https://xdelta.googlecode.com/files/xdelta3-3.0.8.tar.xz
tar xJvf xdelta3-3.0.8.tar.xz
cd xdelta3-3.0.8/
Build and install:
./configure
make
sudo make install
Check if it works:
cd examples/
make clean
make encode_decode_test
./encode_decode_test
If everything is fine, you should have executable file "encode_decode_test". It's example uses xdelta3. Now you can build your program the same way. See "Makefile" file inside of "examples" directory to get a clue how to build your program. Note that there is no libraries involved now.