Build problem on Mac OS X

[Selur]

fftw3f checking failed and I have no clue why

Selurs-Mac-mini:VapourSynth-FFT3DFilter selur$ ./configure
~/vsfilters/VapourSynth-FFT3DFilter ~/vsfilters/VapourSynth-FFT3DFilter
~/vsfilters/VapourSynth-FFT3DFilter
CXXFLAGS/LDFLAGS checking...
warning: pkg-config or pc files not found, lib detection may be inaccurate.
checking for fftw3f...
error: fftw3f checking failed.
error: fftw3.h might not be installed or some libs missing.
Selurs-Mac-mini:VapourSynth-FFT3DFilter selur$ pkg-config --version
0.29.1
Selurs-Mac-mini:VapourSynth-FFT3DFilter selur$ ls /usr/local/lib/libfftw3*
/usr/local/lib/libfftw3.3.dylib /usr/local/lib/libfftw3_threads.a /usr/local/lib/libfftw3f.dylib /usr/local/lib/libfftw3l.3.dylib /usr/local/lib/libfftw3l_threads.a
/usr/local/lib/libfftw3.a /usr/local/lib/libfftw3_threads.dylib /usr/local/lib/libfftw3f_threads.3.dylib /usr/local/lib/libfftw3l.a /usr/local/lib/libfftw3l_threads.dylib
/usr/local/lib/libfftw3.dylib /usr/local/lib/libfftw3f.3.dylib /usr/local/lib/libfftw3f_threads.a /usr/local/lib/libfftw3l.dylib
/usr/local/lib/libfftw3_threads.3.dylib /usr/local/lib/libfftw3f.a /usr/local/lib/libfftw3f_threads.dylib /usr/local/lib/libfftw3l_threads.3.dylib
Selurs-Mac-mini:VapourSynth-FFT3DFilter selur$ ls /usr/local/include/ff*
/usr/local/include/fftw3.f /usr/local/include/fftw3.f03 /usr/local/include/fftw3.h /usr/local/include/fftw3l.f03 /usr/local/include/fftw3q.f03

Is this a bug or am I missing something?