From a9775db4e0c085fa55637032be5a3629b96b831d Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Thu, 10 Sep 2020 15:12:23 +0200
Subject: CMake: Fix incorrect logical negation

---
 CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 329e9677..0256bbb9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -161,10 +161,10 @@ check_symbol_exists(clock_gettime "time.h" HAVE_CLOCK_GETTIME)
 
 # Check for argp
 check_symbol_exists(argp_parse "argp.h" HAVE_ARGP)
-if (!HAVE_ARGP)
+if (NOT HAVE_ARGP)
   message(ERROR "argp not found.  If you're building on Mac OS using libraries"
                 "from Homebrew, install argp-standalone.")
-endif (!HAVE_ARGP)
+endif (NOT HAVE_ARGP)
 
 # Add the libcrystfel target
 add_subdirectory(libcrystfel)
-- 
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