问题
A function I want to use in Sage throws an exception because it is missing GAP's package "HAP". I can download this package, but I don't know how to make Sage recognize it.
回答1:
Well, to answer myself, the relevant page is this.
To install one of these packages, type e.g., the following at the UNIX shell prompt:
sage -i db-jones-2005-11-02
Note that the package name contains the version number, and it will be downloaded automatically if necessary.
回答2:
you can type in
sage -optional
to get a list of optional sage packages. install them like
sage -i database_gap
PS: if your download is slow, go into the packages directory on a sage mirror. then copy/paste the full URL.
来源：https://stackoverflow.com/questions/9064343/adding-a-missing-gap-package-to-sage