[dennou-ruby:003983] gem updateでruby-fftw3のbuildエラー on MacOSX(10.10)

[Hisashi YASHIRO <h.yashiro@xxxxxxxx>]

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static VALUE
#ifdef FFTW3_HAS_SINGLE_SUPPORT
na_fftw3_r2r_float(int argc, VALUE *argv, VALUE self)

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$ clang -v
Apple LLVM version 7.0.2 (clang-700.1.81)

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$ sudo gem install gphys
Building native extensions.  This could take a while...
ERROR:  Error installing gphys:
	ERROR: Failed to build gem native extension.

    /opt/local/bin/ruby2.2 -r ./siteconf20160801-40524-1ocd1nh.rb extconf.rb
checking for narray.h... yes
checking for narray_config.h... yes
checking for fftw3.h... yes
checking for main() in -lfftw3... yes
checking for main() in -lfftw3f... no
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling na_fftw3.c
na_fftw3.c:648:1: error: cannot combine with previous 'type-name' declaration specifier
void
^
1 error generated.
make: *** [na_fftw3.o] Error 1

make failed, exit code 2

Gem files will remain installed in /opt/local/lib/ruby2.2/gems/2.2.0/gems/ruby-fftw3-1.0.1 for inspection.
Results logged to /opt/local/lib/ruby2.2/gems/2.2.0/extensions/x86_64-darwin-14/2.2.0/ruby-fftw3-1.0.1/gem_make.out

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--
Hisashi Yashiro, Ph.D

Computational Climate Science Research Team
RIKEN Advanced Institute for Computational Science (AICS)

E-mail: h.yashiro@xxxxxxxx
Tel:+81-78-940-5731 Fax:+81-78-304-4963