diff --git a/CBQN b/CBQN
deleted file mode 160000
index 982a54d..0000000
--- a/CBQN
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 982a54d98a4d2a37f40d0cc711b0ad5e396613e3
diff --git a/Makefile b/Makefile
index bd7efc3..f5c4e18 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ run: 2048.bqn
 	./CBQN/BQN 2048.bqn
 
 .check-and-reinit-submodules:
-	@if git submodule status | egrep -q '^[-]|^[+]' ; then \
+	@if git submodule status | grep -Eq '^[-]|^[+]' ; then \
 		echo "INFO: reinitializing git submodules"; \
 		git submodule update --init; \
 	fi