From 1ad25369e766edfb16bad50ddcecddd3bd3b5879 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beat=20K=C3=BCng?= <beat-kueng@gmx.net>
Date: Wed, 12 May 2021 09:59:25 +0200
Subject: [PATCH] Makefile: ensure 'clean' does not fail if build directory
 does not exist

---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index c278f1a2ad..bcf918e398 100644
--- a/Makefile
+++ b/Makefile
@@ -468,7 +468,7 @@ validate_module_configs:
 .PHONY: clean submodulesclean submodulesupdate gazeboclean distclean
 
 clean:
-	@find "$(SRC_DIR)/build" -mindepth 1 -maxdepth 1 -type d -exec sh -c "echo {}; cmake --build {} -- clean || rm -rf {}" \; # use generated build system to clean, wipe build directory if it fails
+	@[ ! -d "$(SRC_DIR)/build" ] || find "$(SRC_DIR)/build" -mindepth 1 -maxdepth 1 -type d -exec sh -c "echo {}; cmake --build {} -- clean || rm -rf {}" \; # use generated build system to clean, wipe build directory if it fails
 	@git submodule foreach git clean -dX --force # some submodules generate build artifacts in source
 
 submodulesclean: