From 4c004d16a2d75b3b913801caeb17568598d79441 Mon Sep 17 00:00:00 2001
From: Frank Werner-Krippendorf <wernerkrippendorf@gmail.com>
Date: Fri, 1 Apr 2022 16:03:43 +0200
Subject: [PATCH] Update CMakeLists.txt

---
 CMakeLists.txt | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad8d0035..31a24ec5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,10 +1,12 @@
 cmake_minimum_required(VERSION 3.13)
 project(sdrpp)
 
-if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-    set(CMAKE_INSTALL_PREFIX "/usr/local")
-else()
-    set(CMAKE_INSTALL_PREFIX "/usr")
+if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+    if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+        set(CMAKE_INSTALL_PREFIX "/usr/local")
+    else()
+        set(CMAKE_INSTALL_PREFIX "/usr")
+    endif()
 endif()
 
 # Configure toolchain for android