diff --git a/libraries/Makefile b/libraries/Makefile
index a73aad1134a06162ff398a8647c2e74fa1e2f3e4..41311b35ef448618c5de2e6ee6f2119f1f253283 100644
--- a/libraries/Makefile
+++ b/libraries/Makefile
@@ -60,6 +60,7 @@ SUBDIRS += $(wildcard ALUT)
 SUBDIRS += $(wildcard stm)
 SUBDIRS += $(wildcard xhtml)
 SUBDIRS += $(wildcard cgi)
+SUBDIRS += $(wildcard arrows)
 ifeq "$(GhcLibsWithObjectIO)" "YES"
 SUBDIRS += $(wildcard ObjectIO)
 endif