connect to database in a OpenCv program

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C++

C

Linux

compilation

Hi.
I recently wrote a program for image progressing with OpenCV libraries. Now I must add some function to it for connecting to MySQL and read a flag. Know I have some question:
1. what must I use? gcc or g++ for compile the program? (in CentOS)
2. How I can compile it? whit which flags and library?

before it, I compile OpenCV program with this command:
g++ imageproc.cpp -o imageproc `pkg-config opencv --cflags --libs

and, I compile querytoMySQL program with this command:
gcc funcname.c -o funcname `mysql_config --cflags --libs`

I tried to give libraries and flags with -L,-l,-I but it doesn't work.