building subversion (with perl bindings) with nix on Mac

a2

/nix/store/y3x7hzdn3363xjz4snaws9glxq3s7732-perl-5.16.3$ grep cpp-precomp -R .
./lib/perl5/5.16.3/darwin-2level/Config_heavy.pl:ccflags='-fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector'
./lib/perl5/5.16.3/darwin-2level/Config_heavy.pl:cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector'
./lib/perl5/5.16.3/darwin-2level/Config_heavy.pl:ccflags_nolargefiles='-fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector'

b.nix

  preConfigure = stdenv.lib.optionalString stdenv.isDarwin ''
    substituteInPlace configure --replace "-no-cpp-precomp" ""
  '';

  preBuild = ''
    makeFlagsArray=(APACHE_LIBEXECDIR=$out/modules)
  '';

gistfile1.txt

## using perl

SWIG_PL_INCLUDES='$(SWIG_INCLUDES)  -fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector  -I/nix/store/y3x7hzdn3363xjz4snaws9glxq3s7732-perl-5.16.3/lib/perl5/5.16.3/darwin-2level/CORE '

This goes wrong because the flag -no-cpp-precomp is not recognised

## using sysPerl

SWIG_PL_INCLUDES='$(SWIG_INCLUDES)  -arch x86_64 -arch i386 -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -I/usr/local/include  -I/System/Library/Perl/5.12/darwin-thread-multi-2level/CORE '

This goes wrong because of the following

gcc: error: x86_64: No such file or directory
gcc: error: i386: No such file or directory
gcc: error: unrecognized option '-arch'
gcc: error: unrecognized option '-arch'