diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9beab25..a6035d44 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required(VERSION 3.0...3.29)
 
 project (MapCache C)
 
diff --git a/cmake/FindGDAL.cmake b/cmake/FindGDAL.cmake
index 65881d21..62b6badf 100644
--- a/cmake/FindGDAL.cmake
+++ b/cmake/FindGDAL.cmake
@@ -73,7 +73,7 @@ if(UNIX)
     )
 
     if(GDAL_CONFIG)
-        exec_program(${GDAL_CONFIG} ARGS --libs OUTPUT_VARIABLE GDAL_CONFIG_LIBS)
+        execute_process(COMMAND ${GDAL_CONFIG} --libs OUTPUT_VARIABLE GDAL_CONFIG_LIBS)
         if(GDAL_CONFIG_LIBS)
             string(REGEX MATCHALL "-l[^ ]+" _gdal_dashl ${GDAL_CONFIG_LIBS})
             string(REGEX REPLACE "-l" "" _gdal_lib "${_gdal_dashl}")