diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e09c92..186d839 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,10 @@ string(TIMESTAMP TODAY "%Y%m%d")
 # way as I am likely to forget to change it later.
 set(BUILD_GUI OFF CACHE BOOL "Disable building the graphical version.")
 
+if (CMAKE_HOST_UNIX)
+	message(STATUS "Build system is POSIX.")
+endif()
+
 if(MSVC)
 	add_compile_options("/W4" "$<$<CONFIG:RELEASE>:/O2>")
 else()