SuperBuild: FFTW: use @rpath for install_name

SuperBuild/CMake/External_fftw.cmake

@@ -40,6 +40,10 @@ else()
       DEPENDS ${FFTW_DEPENDENCIES}
       )
 
+    if(APPLE)
+      SUPERBUILD_PATCH_SOURCE(FFTWF "patch-for-at-rpath" ${CMAKE_SOURCE_DIR}/patches/FFTW)
+    endif()
+
     # Compile the double version of FFTW
     ExternalProject_Add(FFTWD
       PREFIX FFTW/FFTWD
@@ -61,6 +65,10 @@ else()
             --disable-dependency-tracking
       )
 
+    if(APPLE)
+      SUPERBUILD_PATCH_SOURCE(FFTWD "patch-for-at-rpath" ${CMAKE_SOURCE_DIR}/patches/FFTW)
+    endif()
+
     ExternalProject_Add(FFTW
       PREFIX FFTW
       DOWNLOAD_COMMAND ""

SuperBuild/patches/FFTW/fftw-osx-rpath-fix.diff

+--- fftw-3.3.4.orig/configure	2016-04-19 09:26:21.000000000 +0200
++++ fftw-3.3.4/configure	2016-04-19 09:27:21.000000000 +0200
+@@ -10776,9 +10776,9 @@
+   esac
+   if test "$_lt_dar_can_shared" = "yes"; then
+     output_verbose_link_cmd=func_echo_all
+-    archive_cmds="\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \$rpath/\$soname \$verstring $_lt_dar_single_mod${_lt_dsymutil}"
++    archive_cmds="\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \@rpath/\$soname \$verstring $_lt_dar_single_mod${_lt_dsymutil}"
+     module_cmds="\$CC \$allow_undefined_flag -o \$lib -bundle \$libobjs \$deplibs \$compiler_flags${_lt_dsymutil}"
+-    archive_expsym_cmds="sed 's,^,_,' < \$export_symbols > \$output_objdir/\${libname}-symbols.expsym~\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \$rpath/\$soname \$verstring ${_lt_dar_single_mod}${_lt_dar_export_syms}${_lt_dsymutil}"
++    archive_expsym_cmds="sed 's,^,_,' < \$export_symbols > \$output_objdir/\${libname}-symbols.expsym~\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \@rpath/\$soname \$verstring ${_lt_dar_single_mod}${_lt_dar_export_syms}${_lt_dsymutil}"
+     module_expsym_cmds="sed -e 's,^,_,' < \$export_symbols > \$output_objdir/\${libname}-symbols.expsym~\$CC \$allow_undefined_flag -o \$lib -bundle \$libobjs \$deplibs \$compiler_flags${_lt_dar_export_syms}${_lt_dsymutil}"
+ 
+   else