Add the Setup line for the pcre module.
diff --git a/Modules/Setup.in b/Modules/Setup.in
index 106e97a..0c424ff 100644
--- a/Modules/Setup.in
+++ b/Modules/Setup.in
@@ -89,7 +89,8 @@
# Some modules that are normally always on:
regex regexmodule.c regexpr.c # Regular expressions, GNU Emacs style
-reop reopmodule.c # Additional RE support (also needs regexpr.c)
+reop reopmodule.c # Additional RE support (for re1.py)
+pcre pcremodule.c pypcre.c # Regular expressions, Perl style (for re.py)
posix posixmodule.c # posix (UNIX) system calls
signal signalmodule.c # signal(2)