1 files changed, 1 insertions, 0 deletions

diff --git a/makefile b/makefile
index 819be29..90dd39f 100644
--- a/makefile
+++ b/makefile
@@ -22,6 +22,7 @@ all: bin \
 	bin/18 \
 	bin/19 \
 	bin/20 \
+	bin/21 \
 
 bin:
 	mkdir -p $@