ext/numo/libsvm/extconf.rb in numo-libsvm-2.1.0 vs ext/numo/libsvm/extconf.rb in numo-libsvm-2.1.1

@@ -18,9 +18,15 @@
     end
   end
   abort 'libnarray.a not found.' unless have_library('narray', 'nary_new')
 end
 
+if RUBY_PLATFORM.match?(/darwin/) && Gem::Version.new('3.1.0') <= Gem::Version.new(RUBY_VERSION)
+  if try_link('int main(void){return 0;}', '-Wl,-undefined,dynamic_lookup')
+    $LDFLAGS << ' -Wl,-undefined,dynamic_lookup'
+  end
+end
+
 abort 'libstdc++ is not found.' unless have_library('stdc++')
 
 $srcs = Dir.glob("#{$srcdir}/**/*.cpp").map { |path| File.basename(path) }
 $INCFLAGS << " -I$(srcdir)/src"
 $VPATH << "$(srcdir)/src"