[Widelands-public] Install path (compile time configuration)

[<st...@up...>]

Hello,
I just came across INSTALL_DATADIR. Its content, at least on my  
system, is bogus ("./share/widelands"). Rather, I suggest to have  
some INSTALL_PREFIX in config.h, which would be exactly what a  
autoconf-script would understand by --prefix and should default to "/ 
usr/local" as with autoconf. Then, in setup.h, instead of

	g_fs->AddFileSystem(FileSystem::CreateFromDirectory 
(INSTALL_DATADIR)); //see config.h for INSTALL_DATADIR

do

	g_fs->AddFileSystem(FileSystem::CreateFromDirectory(INSTALL_PREFIX "/ 
share/widelands"));

and do not use current working directory anymore on UNIX release  
builds as a fallback. There should be some option to set the prefix,  
preferable called --prefix as well to avoid confusion. Of course, the  
binary belongs to $INSTALL_PREFIX/bin.

Stefan