Hi Jakob - Answering your questions up front:
The 'version 6.0.0' refers to the embedded versioning info inside the
library which is being loaded. FFTW 3.2 embeds versioning info
"6.2.0" for some reason. So I would tend to believe that FFTW 2.X
embeds info "5.X.0". IIRC: GNU Radio requires the 3.X libraries, and
you can't execute GR applications without it.
To get back to your issue, I would guess there are 2 potential problems:
1) 'configure' is finding FFTW3 from pkg-config (as desired), but it's
not the version which occurs first in your shell environment's
DYLD_LIBRARY_PATH ... so compiling happens with one, but loading with
another. Unless you -truly- require the DYLD_LIBRARY_PATH, don't use
it; it will cause you headaches. There are ways around using this
variable; use those instead.
2) PKG_CONFIG_PATH isn't set correctly in your shell environment: /opt/
local/lib/pkgconfig must be first in the list.
If neither of these work, then email me off list with the results of
"env" (executed in your shell of choice) as well as which libraries /
apps you installed from where, and I'll do what I can to help. - MLD
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