extconf.rb in numo-pocketfft-0.4.1

- old
+ new

@@ -24,9 +24,15 @@
     puts 'libnarray.a not found.'
     exit(1)
   end
 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
+
 $CFLAGS = "#{$CFLAGS} -std=c99"
 
 $srcs = Dir.glob("#{$srcdir}/**/*.c").map { |path| File.basename(path) }
 $VPATH << "$(srcdir)/src"
 