GAP is distributed together with a large number of packages, including
this one. CaratInterface is located inside the subdirectory
pkg/CaratInterface/ of your GAP installation, and the CARAT
programs contained in it must be compiled. Compilation is most
conveniently done with the script BuildPackages.sh from GAP.
You can either build (almost) all packages, or only a single one
by giving its name on the command line. Alternatively, you can
compile CARAT inside CaratInterface manually, by executing
these commands inside the directory pkg/CaratInterface/:
./configure <path-to-GAP-root> make
The configure script optionally takes the path to the root directory of
your GAP installation as argument. The default ../.. should usually
work, if the package is located in the pkg subdirectory of the GAP
root directory,
but if you have unpacked CaratInterface to a location like
/.gap/pkg/CaratInterface/, you need to explicitly give the path to
the GAP root directory as argument. The result of configure is
written to the file config.carat, which can be inspected if something
goes wrong.
If GAP was configured to use a specific GMP library, or the GMP library
bundled with GAP, then CARAT will try to use that same GMP library.
Otherwise, the system GMP library in the default path is chosen. If you want
to use another GMP library, you may add an argument --with-gmp=path-to-gmp
to the above configure command, where the directory path-to-gmp must
contain subdirectories lib/ and include/ with the GMP library and include
files, respectively.
If you want or need to add further compile or link flags, you may prepend
CFLAGS="your flags" to the configure command, or append it to the make
command (one of these is enough), so that the complete build commands
including all options are these:
[CFLAGS="<your flags>"] ./configure [<path-to-GAP-root>] [--with-gmp=<path-to-gmp>] make [CFLAGS="<your flags>"]
As CARAT's catalog of Q-classes of unimodular groups is rather large,
it is unpacked by default only up to dimension 5. If you also want
to unpack the data for dimension 6, you can do this with the extra
command (again inside directory pkg/CaratInterface/)
make qcat6
This adds another 150 Mb of data to the installation.
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CaratInterface manual