Index: Makefile
  ===================================================================
  RCS file: /cvsroot/pkgsrc/math/fftw/Makefile,v
  retrieving revision 1.27
  diff -r1.27 Makefile
  30a31,34
  > .if ${OPSYS} == "DragonFly"
  > ALL_ENV+=		CCVER=gcc34
  > .endif
  > 

It's no big deal, but please use "diff -u" for patches.

It seems that this should be done by USE_LANGAGES+=fortran, rather than
an OS-specific fix.  That's already in the Makefile.

NetBSD-current has:

  gdt 40 /usr/pkgsrc/math/fftw > cc -v
  Using built-in specs.
  Target: i386--netbsdelf
  Configured with: /usr/src/tools/gcc/../../gnu/dist/gcc4/configure --enable-long-long --disable-multilib --enable-threads --disable-symvers --build=x86_64-unknown-netbsd4.99.17 --host=i386--netbsdelf --target=i386--netbsdelf
  Thread model: posix
  gcc version 4.1.3 20070620 prerelease (NetBSD nb1 20070620)

On my system, building fftw starts to build f2c.
What happens on yours?