Here's some basic instructions on compiling VBAGX. You don't need to be a programmer to follow these instructions but you should have some basic computer know-how. There's a few reasons you might want to do this:

1. To use the latest version of the emulator (note that beta versions may be unstable)
2. To access roms/saves from Windows File Sharing (SMB), without needing an SD card - just edit vbaconfig.cpp
3. To make your own custom changes

Instructions

1. Ensure that you have devkitPPC r18 and libogc 1.8.0 or higher installed. If you have an older version, completely uninstall it first.
2. Download and copy the ported libraries to your PPC portlibs folder (on Windows this is c:\devkitPro\portlibs\ppc)
3. Download the source from SVN.
4. Run Programmer's Notepad (installed with devkitPro)
5. Find the Makefile from the source you downloaded. Click Tools > Make.
6. You're done!