Package was not found in the pkg-config search path

I am trying to install WaoN. When I run sudo make -f Makefile.waon it gives me the following errors:

gcc -Wall -march=pentium -O3 -ffast-math `pkg-config --cflags fftw3` `pkg-config --cflags sndfile`   -c -o main.o main.c
Package fftw3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `fftw3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'fftw3' found
Package sndfile was not found in the pkg-config search path.
Perhaps you should add the directory containing `sndfile.pc'
to the PKG_CONFIG_PATH environment variable
No package 'sndfile' found
main.c:31:19: fatal error: fftw3.h: No such file or directory
 #include <fftw3.h>
                   ^
compilation terminated.
make: *** [main.o] Error 1

I installed FFTW3 with sudo apt-get install libfftw3-3 and libsndfile with sudo apt-get install libsndfile1. But this problem remains. How can I fix it?