Apparently __GNU_LIBRARY__ is defined for glibc as well as for libc5.
The test really wanted to distinguish between the two. So now we test
for __GLIBC__ instead. I have confirmed that this works for glibc and
I have an email from Christian Tanzer confirming that it works for
libc5, so it should be fine.
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index bd6d727..aa4cc44 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -616,7 +616,7 @@
/* Squirrel away the module's dictionary for the y2k check */
Py_INCREF(d);
moddict = d;
-#if defined(HAVE_TZNAME) && !defined(__GNU_LIBRARY__)
+#if defined(HAVE_TZNAME) && !defined(__GLIBC__)
tzset();
#ifdef PYOS_OS2
ins(d, "timezone", PyInt_FromLong((long)_timezone));
@@ -634,7 +634,7 @@
#endif
ins(d, "daylight", PyInt_FromLong((long)daylight));
ins(d, "tzname", Py_BuildValue("(zz)", tzname[0], tzname[1]));
-#else /* !HAVE_TZNAME || __GNU_LIBRARY__ */
+#else /* !HAVE_TZNAME || __GLIBC__ */
#ifdef HAVE_TM_ZONE
{
#define YEAR ((time_t)((365 * 24 + 6) * 3600))
@@ -683,7 +683,7 @@
ins(d, "tzname", Py_BuildValue("(zz)", "", ""));
#endif /* macintosh */
#endif /* HAVE_TM_ZONE */
-#endif /* !HAVE_TZNAME || __GNU_LIBRARY__ */
+#endif /* !HAVE_TZNAME || __GLIBC__ */
if (PyErr_Occurred())
Py_FatalError("Can't initialize time module");
}