From 3b38e6954add9b5b19fc194210438e1a865879ca Mon Sep 17 00:00:00 2001
From: Nic Aitch <nic@nicinabox.com>
Date: Fri, 9 Jun 2017 09:14:44 -0500
Subject: Use single brackets for portability with other shells

---
 keyboards/lets_split/rules.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/keyboards/lets_split/rules.mk b/keyboards/lets_split/rules.mk
index 79860ea35d..43eff99e71 100644
--- a/keyboards/lets_split/rules.mk
+++ b/keyboards/lets_split/rules.mk
@@ -78,7 +78,7 @@ CUSTOM_MATRIX = yes
 avrdude: build
 	ls /dev/tty* > /tmp/1; \
 	echo "Reset your Pro Micro now"; \
-	while [[ -z $$USB ]]; do \
+	while [ -z $$USB ]; do \
 	  sleep 1; \
 	  ls /dev/tty* > /tmp/2; \
 	  USB=`diff /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \
-- 
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