1 files changed, 1 insertions, 0 deletions
diff --git a/devel/Makefile b/devel/Makefile
index 7ce7f4a7019e..ecdd2826a06f 100644
--- a/devel/Makefile
+++ b/devel/Makefile
@@ -359,6 +359,7 @@
     SUBDIR += ruby-intl
     SUBDIR += ruby-libglade
     SUBDIR += ruby-locale
+    SUBDIR += ruby-mutexm
     SUBDIR += ruby-optparse
     SUBDIR += ruby-property
     SUBDIR += ruby-racc