[LAD] Finding libfftw3 with cmake

[Jeanette C.]

Hey hey,
what is the easiest way to find libfftw3 with cmake? I've seen a few 
find_package scripts, but they don't appear to work. The source compiles, but 
gets linking problems.

I've seen something in Yoshimi using pkg_check_modules but I don't completely 
understand the following mechanism nor am I completely sure which module to 
include to get that function.

Could someone please help?

Best wishes,

Jeanette

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