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 diff --git a/testsuite/testsuite.rb b/testsuite/testsuite.rb
index fcda4a8..f5e3906 100755
--- a/testsuite/testsuite.rb
+++ b/testsuite/testsuite.rb
@@ -127,9 +127,10 @@ def with_environment(variables={})
 end
 
 def python_tests_runnable?
-  if `which python`.empty? then
-    return false
-  end
+  return false unless
+    ENV['PATH'].split(File::PATH_SEPARATOR).any? do |directory|
+      File.executable?(File.join(directory, "python"))
+    end
   require "open3"
   runline = "python #{$gtpython}/gt/dlload.py"
   with_environment({"PYTHONPATH" => $gtpython, \