=== modified file 'configure.in'
--- configure.in	2009-01-13 09:30:52 +0000
+++ configure.in	2009-01-13 09:35:48 +0000
@@ -186,6 +186,7 @@
      with_fftw3=no
     ])
   IP_CFLAGS="$FFTW_INCLUDES $FFTW3_CFLAGS $IP_CFLAGS"
+  IP_LIBS="$FFTW3_LIBS $IP_LIBS"
 fi
 
 # optional ... we add some gsl funcs as builtins if available