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You need to install the optional package qepcad. Do this by running the following in a terminal:

sage -i qepcad

Then you can follow the tutorial in the documentation page for the SageMath interface to QEPCAD.

That tutorial has a sentence saying it assumes or requires the QEPCAD optional package to be installed.

Possibly we should add a line right next to that comment reminding the user how to install it.

You need to install the optional package qepcad. qepcad.

Do this by running the following in a terminal:

sage -i qepcad

Then you can follow the tutorial in the documentation page for the SageMath interface to QEPCAD.

That tutorial has contains the following sentence, after a sentence saying it assumes or requires few introductory paragraphs:

The examples below require that the QEPCAD optional qepcad package to be is installed.

Possibly we should add a line right next to that comment reminding the user how to install it.

You need to install the optional package qepcad.

Do this by running the following in a terminal:

sage -i qepcad

Then you can follow the tutorial in the documentation page for the SageMath interface to QEPCAD.

That tutorial contains the following sentence, after a few introductory paragraphs:

The examples below require that the optional qepcad package is installed.

Possibly we should add a line right next to that comment reminding the user how to install it.

Sadly the SageMath installer for Windows currently does not support installing extra packages that require rebuilding Sage.

Under Windows you might want to install Cygwin and build Sage under Cygwin. See the "Sage Cygwin-64 port" wiki page.

You need to install the optional package qepcad.

Do this by running the following in a terminal:

sage -i qepcad

Then you can follow the tutorial in the documentation page for the SageMath interface to QEPCAD.

That tutorial contains the following sentence, after a few introductory paragraphs:

The examples below require that the optional qepcad package is installed.

Possibly we should add a line right next to that comment reminding the user how to install it.

Sadly the SageMath installer for Windows currently does not support installing extra packages that require rebuilding Sage.

Under Windows Windows, if you feel like it, you might want to install Cygwin and build Sage yourself under Cygwin. See the "Sage Cygwin-64 port" wiki page.

Other options include using SageDebianLive, or the SageAppliance, or CoCalc.

Example of using QEPCAD: see this CoCalc worksheet.