diff -Naurp sh-1.12.14.orig/test.py sh-1.12.14/test.py
--- sh-1.12.14.orig/test.py	2017-06-06 21:51:42.000000000 -0500
+++ sh-1.12.14/test.py	2017-06-07 11:27:04.912212886 -0500
@@ -515,17 +515,28 @@ while True:
             "VERSIONER_PYTHON_VERSION",
         ]
 
+        # Fedora adds some extra environment variables as well.
+        # See https://www.python.org/dev/peps/pep-0538/ for more info.
+        fedora_cruft = [
+            "LC_CTYPE",
+            "LANG"
+        ]
+
         # first we test that the environment exists in our child process as
         # we've set it
         py = create_tmp_test("""
 import os
 
 osx_cruft = %s
+fedora_cruft = %s
 for key in osx_cruft:
     try: del os.environ[key]
     except: pass
+for key in fedora_cruft:
+    try: del os.environ[key]
+    except: pass
 print(os.environ["HERP"] + " " + str(len(os.environ)))
-""" % osx_cruft)
+""" % (osx_cruft, fedora_cruft))
         out = python(py.name, _env=env).strip()
         self.assertEqual(out, "DERP 1")
 
@@ -534,11 +545,15 @@ import os, sys
 sys.path.insert(0, os.getcwd())
 import sh
 osx_cruft = %s
+fedora_cruft = %s
 for key in osx_cruft:
     try: del os.environ[key]
     except: pass
+for key in fedora_cruft:
+    try: del os.environ[key]
+    except: pass
 print(sh.HERP + " " + str(len(os.environ)))
-""" % osx_cruft)
+""" % (osx_cruft, fedora_cruft))
         out = python(py.name, _env=env, _cwd=THIS_DIR).strip()
         self.assertEqual(out, "DERP 1")