patch #1668: clarify envvar docs; rename THREADDEBUG to PYTHONTHREADDEBUG.
diff --git a/Python/import.c b/Python/import.c
index 8094f7d..d9550f5 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -1630,7 +1630,7 @@
 	FILEFINDBUF3 ffbuf;
 	APIRET rc;
 
-	if (getenv("PYTHONCASEOK") != NULL)
+	if (Py_GETENV("PYTHONCASEOK") != NULL)
 		return 1;
 
 	rc = DosFindFirst(buf,
diff --git a/Python/thread.c b/Python/thread.c
index 3a2c7af..9a4dc25 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -79,7 +79,7 @@
 PyThread_init_thread(void)
 {
 #ifdef Py_DEBUG
-	char *p = getenv("THREADDEBUG");
+	char *p = Py_GETENV("PYTHONTHREADDEBUG");
 
 	if (p) {
 		if (*p)