prefix=/data/mxe/usr/x86_64-w64-mingw32.shared.all
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: FFTW
Description: fast Fourier transform library
Version: 3.3.10
Libs: -L${libdir} -lfftw3f 
Libs.private: -lm
Cflags: -I${includedir}