Free cmake version for Apple

Author: aymanhab

.github/workflows/continuous-integration.yml

@@ -283,7 +283,7 @@ jobs:
         # TODO: Do not hard-code NetBeans version.
         # TODO: Could download from https://download.netbeans.org/netbeans/8.2/final/bundles/netbeans-8.2-javase-macosx.dmg
         # cmake ../ -DCMAKE_PREFIX_PATH=~/opensim-core -DANT_ARGS="-Dnbplatform.default.netbeans.dest.dir=/Applications/NetBeans/Apache NetBeans 12.3.app/Contents/Resources/NetBeans/netbeans;-Dnbplatform.default.harness.dir=/Applications/NetBeans/Apache NetBeans 12.3.app/Contents/Resources/NetBeans/netbeans/harness"
-        cmake ../ -DCMAKE_POLICY_VERSION_MINIMUM=3.5 -DCMAKE_PREFIX_PATH=~/opensim-core-install -DANT_ARGS="-Dnbplatform.default.netbeans.dest.dir=/Applications/NetBeans/Apache NetBeans 12.3.app/Contents/Resources/NetBeans/netbeans;-Dnbplatform.default.harness.dir=/Applications/NetBeans/Apache NetBeans 12.3.app/Contents/Resources/NetBeans/netbeans/harness"
+        cmake ../ -DCMAKE_PREFIX_PATH=~/opensim-core-install -DANT_ARGS="-Dnbplatform.default.netbeans.dest.dir=/Applications/NetBeans/Apache NetBeans 12.3.app/Contents/Resources/NetBeans/netbeans;-Dnbplatform.default.harness.dir=/Applications/NetBeans/Apache NetBeans 12.3.app/Contents/Resources/NetBeans/netbeans/harness"
         make CopyOpenSimCore
         make PrepareInstaller
         # Read the value of the cache variable storing the GUI build version.

CMakeLists.txt

@@ -3,8 +3,9 @@ cmake_policy(SET CMP0048 NEW)
 
 project(OpenSimApp VERSION 4.6)
 
-cmake_minimum_required(VERSION 3.15)
-
+if (NOT APPLE)
+	cmake_minimum_required(VERSION 3.15)
+endif()
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
 
 add_subdirectory(Gui/opensim)