--- lib/CMakeLists.txt.orig	2019-07-19 07:29:49 UTC
+++ lib/CMakeLists.txt
@@ -32,7 +32,7 @@ add_definitions( -DVERSION="${VERSION}" )
 
 if(NOT MSVC)
 	add_definitions(-Wall)
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu90")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu89")
 endif()
 
 add_subdirectory(src)