The platform independent files are distributed as a GNU-zipped tar file. Hence, the first step is to unpack the file abacus.tar.gz. Copy abacus.tar.gz to the directory where you want ABACUS to be installed (e.g. /usr/local) and call:
gzip -d abacus.tar.gz tar xf abacus.tarAfter this installation you should obtain a platform and LP-solver dependent library, e.g., for Linux in combination with Cplex 4.0 the library libabacus.linux.cplex40.a.gz. After uncompressing it with
gzip -d libabacus.linux.cplex40.a.gzyou might like to move it to the subdirectory abacus/lib or an other directory.