--- /dev/null
+From 26d417b9f981cf9a6df42d89fd297539b96180cb Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Fri, 24 Apr 2020 18:03:31 +0200
+Subject: [PATCH] CMakeLists.txt: fix CMAKE_BUILD_TYPE (#188)
+
+The user is unable to override CMAKE_BUILD_TYPE since version 1.9.1 and
+https://github.com/libspatialindex/libspatialindex/commit/e3bcccf38d9f100b59ccf29f7e1cfa174969decd
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Retrieved from:
+https://github.com/libspatialindex/libspatialindex/commit/26d417b9f981cf9a6df42d89fd297539b96180cb]
+---
+ CMakeLists.txt | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 191ac72..84676a2 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -93,8 +93,10 @@ INCLUDE (CheckIncludeFiles)
+
+ # note we default to RelWithDebInfo mode
+ if(NOT MSVC_IDE)
++ if(NOT CMAKE_BUILD_TYPE)
+ set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING
+ "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel" FORCE)
++ endif()
+ message(STATUS "Setting libspatialindex build type - ${CMAKE_BUILD_TYPE}")
+ endif()
+