186998 – [patch] math/fftw3 port fails during configure on i386 with clang

no flags

When attempting to build the math/fftw3 port, it fails during the configure
step:

checking for gcc... cc
checking whether the C compiler works... no
configure: error: in `/usr/ports/math/fftw3/work/fftw-3.3.3':
configure: error: C compiler cannot create executables
See `config.log' for more details
===>  Script "configure" failed unexpectedly.
Please report the problem to bf@FreeBSD.org [maintainer] and attach the
"/usr/ports/math/fftw3/work/fftw-3.3.3/config.log" including the output of
the failure of your make command. Also, it might be a good idea to provide
an overview of all packages installed on your system (e.g. a
/usr/local/sbin/pkg-static info -g -Ea).
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/math/fftw3
*** Error code 1

Stop.
make: stopped in /usr/ports/math/fftw3

The following snippet of config.log shows that the cause of the problem is
that clang rejects the -malign-double command line option:

configure:4046: checking whether the C compiler works
configure:4068: cc -O2 -pipe -march=athlon64 -O3 -ffast-math -fstrict-aliasing -efomit-frame-pointer -malign-double   conftest.c  >&5
cc: error: unknown argument: '-malign-double'
configure:4072: $? = 1
configure:4110: result: no
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "fftw"
| #define PACKAGE_TARNAME "fftw"
| #define PACKAGE_VERSION "3.3.3"
| #define PACKAGE_STRING "fftw 3.3.3"
| #define PACKAGE_BUGREPORT "fftw@fftw.org"
| #define PACKAGE_URL ""
| #define PACKAGE "fftw"
| #define VERSION "3.3.3"
| #define FFTW_ENABLE_ALLOCA 1
| #define HAVE_SSE2 1
| /* end confdefs.h.  */
|
| int
| main ()
| {
|
|   ;
|   return 0;
| }
configure:4115: error: in `/usr/ports/math/fftw3/work/fftw-3.3.3':
configure:4118: error: C compiler cannot create executables
See `config.log' for more details

Fix: The following Makefile patch fixes the problem for me.  It is untested
on a machine with gcc.
How-To-Repeat: 
Attempt to build the port on an i386 with clang version 3.4.