From c6445c615b5eb75923f87d61b1b19dac5f023ad5 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Mon, 23 Oct 2023 16:42:12 -0400
Subject: Tests/RunCMake/Ninja: fix subdir prefix check

If the output path prefix is empty, the directory is going to exist.
---
 Tests/RunCMake/Ninja/CheckNoPrefixSubDirScript.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Tests/RunCMake/Ninja/CheckNoPrefixSubDirScript.cmake b/Tests/RunCMake/Ninja/CheckNoPrefixSubDirScript.cmake
index 5a03fcb..09fd7e9 100644
--- a/Tests/RunCMake/Ninja/CheckNoPrefixSubDirScript.cmake
+++ b/Tests/RunCMake/Ninja/CheckNoPrefixSubDirScript.cmake
@@ -1,6 +1,6 @@
 # Check that the prefix sub-directory is not repeated.
 
-if(EXISTS "${CUR_BIN_DIR}/${NINJA_OUTPUT_PATH_PREFIX}")
+if(NINJA_OUTPUT_PATH_PREFIX AND EXISTS "${CUR_BIN_DIR}/${NINJA_OUTPUT_PATH_PREFIX}")
   message(FATAL_ERROR
     "no sub directory named after the CMAKE_NINJA_OUTPUT_PATH_PREFIX "
     "should be in the binary directory."
-- 
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