This version of Ygdrasil has been compiled on SGI IRIX 6.5.1/Performer 2.4 and Redhat Linux 7.3(gcc 2.96)/Performer 3.0.2.
The Ygdrasil software uses the Bergen Sound Library for sound. 
The Ygdrasil(YG) software requires that SGI Performer be installed on the machine. 

Add the envrinment variable ARCHITECTURE to your profile:
setenv ARCHITECTURE sgi
or
setenv ARCHITECTURE linux

The default installation location for Ygdrasil is /usr/local/yg.
The YG_DIR variable should be changed in the RUN file to reflect the actual installation location.

The default installation location for Bergen is /usr/local/bergen
The BERGEN_DIR variable should be changed in the RUN file to reflect the actual installation location.

The Ygdrasil code can be recompiled and relinked by using the makefiles in src, modules, and repeater.
To recompile and relink execute "make clean" followed by "make".
A relink will, however, require that the CAVE library and the CAVERN library are installed.
The CAVE library can be purchased from VRCO at www.vrco.com.
Although the CAVE library has become a commercial product, many educational institutions have older versions.
The CAVERN software library is open source and can be found at www.evl.uic.edu/yg

When not in the default location, change the YG_DIR variable in the following files when making:
src/Makefile
modules/Makefile
repeater/Makefile

The Bergen Sound Library should be compiled before compiling and linking YG
