How to say to latexmk to use makeindex with special parameter (-s -g)

Question

I use makeindex routinely for a German book. A new latex package sanitize-umlaut allows now to write index terms without umlaute for example \index{Östrogene} instead of \index{Oestrogene@{Östrogene}}. To make it work properly one hat to use

makeindex -s german -g book

I would like to pass this parameters to latexmk. I do not see how to do this. The makeindex command is usually

makeindex book

I looked through latexmk questions but did not find an appropriate one.

Answer 1

In the latexmk manual [1, page 26], there is a configuration variable which can change the makeindex-command:

$makeindex ["makeindex %O -o %D %S"]

The indexprocessing program.

The value in square brackets is the default.

You can overwrite this default by creating a file latexmkrc in the directory of your document with the following code:

$makeindex = 'makeindex -s german -g %S';

Then call latexmk as usual. The defaults will be overwritten.

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PS: You can define more options in the latexmkrc, for example @default_files = ('document.tex'), etc.

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Edit: As Bernhard pointed out it's better to use -g %S instead of the hardcoded -g book