Build and install libpython3.so.
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 9fbcef8..f86621b 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -497,6 +497,9 @@
 /* Define to 1 if you have the `pause' function. */
 #undef HAVE_PAUSE
 
+/* Define if the OS supports pipe2() */
+#undef HAVE_PIPE2
+
 /* Define to 1 if you have the `plock' function. */
 #undef HAVE_PLOCK