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bash - How to fix Makefile syntax error when using wildcard on make clean?

I have a simple Makefile that just contains this one target. It looks like this:

SHELL:=/bin/bash

clean:
    rm !(*.tex|Makefile|*.pdf)

When I run this command in bash it works fine, i.e. it gives no errors and it removes the desired files. However when I run make clean it gives the following errors:

$ make clean
rm !(*.tex|Makefile|*.pdf)
/bin/bash: -c: line 0: syntax error near unexpected token `('
/bin/bash: -c: line 0: `rm !(*.tex|Makefile|*.pdf)'
make: *** [clean] Error 1

Has anybody got an idea what I'm doing wrong? Thanks.

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by (71.8m points)

Change the SHELL line to

SHELL:=/bin/bash -O extglob

The extglob option is not set by default, so you have to do that yourself.


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