diff --git a/Lib/irix5/regen b/Lib/irix5/regen
index f9afa7d..13f9d74 100755
--- a/Lib/irix5/regen
+++ b/Lib/irix5/regen
@@ -9,3 +9,4 @@
 h2py /usr/include/sys/socket.h
 h2py -i '(u_long)' /usr/include/netinet/in.h
 h2py /usr/include/sys/termios.h
+h2py /usr/include/errno.h
diff --git a/Lib/plat-irix5/regen b/Lib/plat-irix5/regen
index f9afa7d..13f9d74 100755
--- a/Lib/plat-irix5/regen
+++ b/Lib/plat-irix5/regen
@@ -9,3 +9,4 @@
 h2py /usr/include/sys/socket.h
 h2py -i '(u_long)' /usr/include/netinet/in.h
 h2py /usr/include/sys/termios.h
+h2py /usr/include/errno.h