From owner-freebsd-ports-bugs@FreeBSD.ORG  Wed Feb 26 05:36:49 2014
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Date: Tue, 25 Feb 2014 21:36:41 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: ports/186998: [patch] math/fftw3 port fails during configure
 on i386 with clang
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This is probably a better patch:

Index: Makefile
===================================================================
--- Makefile	(revision 345674)
+++ Makefile	(working copy)
@@ -19,7 +19,7 @@
 FFTW3_SUFX=
 
 GNU_CONFIGURE=	yes
-USES=		pathfix perl5 pkgconfig
+USES=		pathfix perl5 pkgconfig compiler:features
 USE_PERL5=	build
 USE_LDCONFIG=	yes
 
@@ -62,7 +62,9 @@
 CFLAGS+=	-fomit-frame-pointer
 .  endif
 .  if ${ARCH} == "i386"
+.    if ${COMPILER_TYPE} == "gcc"
 CFLAGS+=	-malign-double
+.    endif
 .  endif
 WITHOUT_NO_STRICT_ALIASING=	yes
 .endif # end OPTIMIZED_CFLAGS