Fix error when invoking python setup.py without being in the same dir

Task-number: PYSIDE-630
Change-Id: I1c707061b29d54bffc132909caaaa2e1b93b4d12
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
(cherry picked from commit 206b75e242143547bce3510dc0ffd54b4769445b)

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 30190acd5..2f46956ca 100644
--- a/setup.py
+++ b/setup.py
@@ -245,7 +245,7 @@ def check_allowed_python_version():
     import re
     pattern = "'Programming Language :: Python :: (\d+)\.(\d+)'"
     supported = []
-    with open(__file__) as setup:
+    with open(this_file) as setup:
         for line in setup.readlines():
             found = re.search(pattern, line)
             if found: