checking for OpenMP flag of C compiler... unknown
configure: error: don't know how to enable OpenMP
===> Script "configure" failed unexpectedly.
Fix: If you chose the openmp option, build fftw3 either with gcc from base or ports.
IIRC base gcc has openmp, gcc46 has it for sure.
Patch attached with submission follows:
How-To-Repeat: try to build fftw3 with openmp support using clang
Over to maintainer (via the GNATS Auto Assign Tool)
bf 2012-06-08 22:38:32 UTC
FreeBSD ports repository
exit earlier, and with a more helpful error message, when attempting to
build the OpenMP libraries with clang ; shorten a long line
PR: 168804 
Revision Changes Path
1.73 +6 -2 ports/math/fftw3/Makefile
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I thought that it was well-known that clang doesn't support OpenMP (in
fact, I disabled the OPENMP option by default as a concession to those
who were experimenting with clang), but I should have known that
someone would try to do this. I will make builds exit earlier, with a
more helpful message, but I am not willing to dictate that users use a
certain compiler. Those users that are using a custom compiler
(clang) with a non-default option (OPENMP) should be prepared to make
this selection themselves, either in the environment, or on the
command-line, or in a number of included Makefiles that are available.
The port has been changed to exit earlier, and with a more helpful error
message, in this case. The user should specify a suitable compiler when
using this option.