which cost me some time to find out about.
oid_file = $ENV::HOME/.oid
oid_section = new_oids
+# To use this configuration file with the "-config" option of the
+# "openssl x509" utility, name here the section containing the
+# X.509v3 extensions to use:
+# extensions =
+# (Alternatively, use a configuration file that has only
+# X.509v3 extensions in its main [= default] section.)
+
[ new_oids ]
# We can add new OIDs in here for use by 'ca' and 'req'.