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Quelle README.md
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# README - Semigroups package for GAP
#### Copyright (C) 2011-2025 James D. Mitchell et al.<br />Licensing information is available in the LICENSE file.
[](https://doi.org/10.5281/zenodo.592893)
## Getting Semigroups
To get the latest version of the package download the archive file
`semigroups-x.x.x.tar.gz` from the [Semigroups][] webpage, and inside the `pkg`
subdirectory of your GAP installation unpack `semigroups-x.x.x.tar.gz`, by, for
example, doing:
gunzip semigroups-x.x.x.tar.gz; tar xvf semigroups-x.x.x.tar
This will create a subdirectory `semigroups-x.x.x`.
## Issues
For questions, remarks, suggestions, and issues please use the
[issue tracker](https://github.com/gap-packages/Semigroups/issues).
## Installation
It is assumed that you have a working copy of GAP with version number 4.12.0 or
higher. The most up-to-date version of GAP and instructions on how to install it
can be obtained from the main [GAP](https://www.gap-system.org) page.
The following is a summary of the steps that should lead to a successful
installation of [Semigroups][]:
* get the [datastructures](https://gap-packages.github.io/datastructures)
package version 0.2.5 or higher
* ensure that the [Digraphs][] package version 1.2.0 or higher is available.
[Digraphs][] must be compiled before [Semigroups][] can be loaded.
* get the [genss](https://gap-packages.github.io/genss) package version 1.6.5 or
higher
* get the [images](https://gap-packages.github.io/images) package version 1.3.0 or
* get the [IO](https://gap-packages.github.io/io) package version 4.5.1 or higher
* get the [orb][] package version 4.8.2 or higher
Both [orb][] and [Semigroups][] perform better when [orb][] is compiled, so compile
[orb][]!
* download the package archive `semigroups-x.x.x.tar.gz` from the
[Semigroups][] webpage.
* unzip and untar the file `semigroups-x.x.x.tar.gz`, for example, using
```
gunzip semigroups-x.x.x.tar.gz; tar xvf semigroups-x.x.x.tar
```
this should create a directory called `semigroups-x.x.x`.
* locate the `pkg` directory of your GAP directory, which contains the
directories `lib`, `doc`, and so on. Move the directory `semigroups-x.x.x`
into the `pkg` directory.
* from version 3.0.0, it is necessary to compile the [Semigroups][] package.
[Semigroups][] uses the [libsemigroups][] C++ library, which requires a compiler
implementing the C++14 standard.
You may either build [libsemigroups][] along with [Semigroups][], or have it
installed at a custom or standard location, as explained in its
documentation. To compile in the former case, inside the
`pkg/semigroups-x.x.x` directory, type
* `./configure`
* `make`
For the latter case, you need a working [pkg-config][] tool; assuming
[libsemigroups][] was installed at location `/foo/bar`, type
* `PKG_CONFIG_PATH=/foo/bar/lib/pkgconfig ./configure --with-external-libsemigroups`
* `make`
If [pkg-config][] has `/foo/bar` among its default locations, then
`PKG_CONFIG_PATH=/foo/bar/lib/pkgconfig` part above may be omitted).
If you are using GCC to compile [Semigroups][], then version 5.0 or higher is
required. Trying to compile [Semigroups][] with an earlier version of GCC will
result in an error at compile time. [Semigroups][] supports GCC version 5.0 or
higher, and clang version 5.0 or higher.
Further information about this step can be found in manual section entitled
“Compiling the kernel module”.
* start GAP in the usual way.
* type `LoadPackage("semigroups");`
Enjoy!
[Semigroups]: https://semigroups.github.io/Semigroups
[libsemigroups]: https://libsemigroups.rtfd.io/
[pkg-config]: https://www.freedesktop.org/wiki/Software/pkg-config/
[orb]: https://gap-packages.github.io/orb
[Digraphs]: https://digraphs.github.io/Digraphs
[ Dauer der Verarbeitung: 0.27 Sekunden
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2026-03-28
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