Issue #4026: Make the fcntl extension build under AIX.
Patch by Sébastien Sablé.
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 309332f..b26b441 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -30,6 +30,9 @@
 /* Define if --enable-ipv6 is specified */
 #undef ENABLE_IPV6
 
+/* Define if flock needs to be linked with bsd library */
+#undef FLOCK_NEEDS_LIBBSD
+
 /* Define if getpgrp() must be called as getpgrp(0). */
 #undef GETPGRP_HAVE_ARG