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-rw-r--r--math/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/math/Makefile b/math/Makefile
index 2255975f0b1e..db625c73a32c 100644
--- a/math/Makefile
+++ b/math/Makefile
@@ -69,6 +69,7 @@
SUBDIR += emacs-calc
SUBDIR += emc2
SUBDIR += entropy
+ SUBDIR += ess
SUBDIR += eukleides
SUBDIR += eval
SUBDIR += facile