Compile using older version (3.0) of CMake
Index: moonlight-embedded/CMakeLists.txt
===================================================================
--- moonlight-embedded.orig/CMakeLists.txt
+++ moonlight-embedded/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(moonlight-embedded C)
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.0)
 SET(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
 include(${CMAKE_ROOT}/Modules/GNUInstallDirs.cmake)
 
@@ -81,7 +81,7 @@ add_subdirectory(libgamestream)
 
 add_executable(moonlight ${SRC_LIST})
 target_link_libraries(moonlight gamestream)
-set_property(TARGET moonlight PROPERTY C_STANDARD 99)
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
 
 if (CEC_FOUND)
   list(APPEND MOONLIGHT_DEFINITIONS HAVE_LIBCEC)
Index: moonlight-embedded/libgamestream/CMakeLists.txt
===================================================================
--- moonlight-embedded.orig/libgamestream/CMakeLists.txt
+++ moonlight-embedded/libgamestream/CMakeLists.txt
@@ -15,7 +15,7 @@ aux_source_directory(../third_party/moon
 add_library(moonlight-common SHARED ${MOONLIGHT_COMMON_SRC_LIST})
 
 add_library(gamestream SHARED ${GAMESTREAM_SRC_LIST})
-set_property(TARGET gamestream PROPERTY C_STANDARD 99)
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
 target_link_libraries(gamestream moonlight-common)
 
 set_target_properties(gamestream PROPERTIES SOVERSION 0 VERSION ${MOONLIGHT_VERSION})