2 Installation

This package must be installed in the pkg subdirectory of any of the GAP 4 root directories. We assume here that this is /gap4/pkg.

cd /gap4/pkg
tar zpxf carat-2.1.7.tar.gz

This creates a subdirectory carat, the home directory of the present interface package. CARAT itself can be installed anywhere on your system. You only have to make sure GAP finds the CARAT binaries, by making a symbolic link from the bin subdirectory in pkg/carat to the bin subdirectory of CARAT itself. In our example, we install CARAT in /gap4/pkg/carat (the CARAT tar file should already be there):

cd /gap4/pkg/carat
zcat carat-2.1b1.tgz | tar pxf -
ln -s carat-2.1b1/bin bin
cd carat-2.1b1

This creates a subdirectory carat-2.1b1, the CARAT top level directory. For the compilation of CARAT, you have to set the variable TOPDIR to the full path of this new directory, possibly along with new values for CC and CFLAGS. You can do this either in the Makefile, or directly on the command line:

make TOPDIR=`pwd` CFLAGS='-O -std=gnu89' 
chmod -R a+rX .

The flag '-std=gnu89' is necessary if you use gcc of version 5 or higher. If you build for more than one architecture, make sure to do a 'make clean' in between.

You now have to check which subdirectory containing the CARAT binaries has been created in the bin directory. The name of this subdirectory must be the same as that in the main GAP bin directory, '/gap4/bin'. If the names differ, you might have to add a symbolic link to correct this. For instance, if the CARAT bin directory contains x86_64-pc-linux-gnu, but in the GAP bin directory, you find x86_64-pc-linux-gnu-gcc-default32, you would have to do this:

cd bin
ln -s x86_64-pc-linux-gnu x86_64-pc-linux-gnu-gcc-default32
ln -s x86_64-pc-linux-gnu x86_64-pc-linux-gnu-gcc-default64

You can use one installation of CARAT for both 32bit and 64bit gap.

Like any other GAP 4 package, CARAT is then loaded in GAP with

gap> LoadPackage("carat");
true

This package, together with CARAT itself, takes some 208Mb of disk space, or more, depending on the system. Some 170Mb is taken by the catalog of Q-classes if integer matrix groups up to dimension 6. If you want to avoid unpacking this catalog, you can create empty subdirectories

cd /gap4/pkg/carat/carat-2.1b1
mkdir tables
mkdir tables/qcatalog

before making CARAT. If you want to unpack the catalog later, just remove the empty directory tables/qcatalog, and do

make Qcatalog

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