--- a/liboctave/CMatrix.cc
+++ b/liboctave/CMatrix.cc
@@ -40,30 +40,27 @@
 #include "Array-util.h"
 #include "CMatrix.h"
 #include "CmplxAEPBAL.h"
-#include "DET.h"
+#include "CmplxCHOL.h"
 #include "CmplxSCHUR.h"
 #include "CmplxSVD.h"
-#include "CmplxCHOL.h"
+#include "DET.h"
 #include "f77-fcn.h"
 #include "functor.h"
 #include "lo-error.h"
-#include "oct-locbuf.h"
 #include "lo-ieee.h"
 #include "lo-mappers.h"
 #include "lo-utils.h"
 #include "mx-base.h"
 #include "mx-cm-dm.h"
+#include "mx-cm-s.h"
 #include "mx-dm-cm.h"
-#include "mx-cm-s.h"
 #include "mx-inlines.cc"
 #include "mx-op-defs.h"
 #include "oct-cmplx.h"
+#include "oct-fftw.h"
+#include "oct-locbuf.h"
 #include "oct-norm.h"
 
-#if defined (HAVE_FFTW3)
-#include "oct-fftw.h"
-#endif
-
 // Fortran functions we call.
 
 extern "C"
@@ -211,20 +208,6 @@
 			     F77_CHAR_ARG_LEN_DECL
 			     F77_CHAR_ARG_LEN_DECL);
 
-  // Note that the original complex fft routines were not written for
-  // double complex arguments.  They have been modified by adding an
-  // implicit double precision (a-h,o-z) statement at the beginning of
-  // each subroutine.
-
-  F77_RET_T
-  F77_FUNC (zffti, ZFFTI) (const octave_idx_type&, Complex*);
-
-  F77_RET_T
-  F77_FUNC (zfftf, ZFFTF) (const octave_idx_type&, Complex*, Complex*);
-
-  F77_RET_T
-  F77_FUNC (zfftb, ZFFTB) (const octave_idx_type&, Complex*, Complex*);
-
   F77_RET_T
   F77_FUNC (zlartg, ZLARTG) (const Complex&, const Complex&,
 			     double&, Complex&, Complex&);
@@ -1217,7 +1200,7 @@
   return retval;
 }
 
-#if defined (HAVE_FFTW3)
+#if defined (HAVE_FFTW)
 
 ComplexMatrix
 ComplexMatrix::fourier (void) const
@@ -1307,6 +1290,23 @@
 
 #else
 
+extern "C"
+{
+  // Note that the original complex fft routines were not written for
+  // double complex arguments.  They have been modified by adding an
+  // implicit double precision (a-h,o-z) statement at the beginning of
+  // each subroutine.
+
+  F77_RET_T
+  F77_FUNC (zffti, ZFFTI) (const octave_idx_type&, Complex*);
+
+  F77_RET_T
+  F77_FUNC (zfftf, ZFFTF) (const octave_idx_type&, Complex*, Complex*);
+
+  F77_RET_T
+  F77_FUNC (zfftb, ZFFTB) (const octave_idx_type&, Complex*, Complex*);
+}
+
 ComplexMatrix
 ComplexMatrix::fourier (void) const
 {