diff --git a/test/mkmf/test_pkg_config.rb b/test/mkmf/test_pkg_config.rb
index d0a2dc130a..abeaf548f8 100644
--- a/test/mkmf/test_pkg_config.rb
+++ b/test/mkmf/test_pkg_config.rb
@@ -3,7 +3,9 @@ require_relative 'base'
 require 'shellwords'
 
 class TestMkmfPkgConfig < TestMkmf
-  PKG_CONFIG = config_string("PKG_CONFIG") {|path| find_executable0(path)}
+  PKG_CONFIG = config_string("PKG_CONFIG") do |path|
+    find_executable0(path, "--version") {$?.success?}
+  end
 
   def setup
     super