Duplicately supply a minimal metadata in setup.py to support setuptools older than 30.4. Fixes #49.

Author: jaraco

CHANGES.rst

@@ -1,3 +1,8 @@
+5.1
+===
+
+* #49: Surgically restore support for older setuptools versions.
+
 5.0
 ===
 

setup.py

@@ -2,5 +2,20 @@
 
 import setuptools
 
+
+compat = dict(
+    name='pytest-runner',
+    py_modules=['ptr'],
+    setup_requires=['setuptools_scm >= 1.15.0'],
+    entry_points={'distutils.commands': ['ptr = ptr:PyTest', 'pytest = ptr:PyTest']},
+)
+"""
+Because pytest-runner is frequently installed by
+setup_requires and thus easy_install, and because
+many systems still run with setuptools prior to
+30.4 in which support for declarative config was
+added, supply the basic metadata here. Ref #49.
+"""
+
 if __name__ == "__main__":
-    setuptools.setup(use_scm_version=True)
+    setuptools.setup(use_scm_version=True, **compat)