From 2f3067ab4110b5cca9c767f3b329ed2c1c64e4b3 Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Sun, 14 Jun 2026 14:29:37 +1000
Subject: [PATCH] CMake: Use C99 to build rcheevos

---
 dep/rcheevos/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dep/rcheevos/CMakeLists.txt b/dep/rcheevos/CMakeLists.txt
index 9b294a5ab..caa8a6428 100644
--- a/dep/rcheevos/CMakeLists.txt
+++ b/dep/rcheevos/CMakeLists.txt
@@ -46,6 +46,12 @@ target_include_directories(rcheevos PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/include
 target_include_directories(rcheevos INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}/include")
 target_compile_definitions(rcheevos PRIVATE "RCHEEVOS_URL_SSL=1" "RC_NO_THREADS=1")
 
+# Use C99.
+set_target_properties(rcheevos PROPERTIES
+  C_STANDARD 99
+  C_STANDARD_REQUIRED ON
+)
+
 # RAIntegration is not supported outside of Win32 and only on x64.
 if(WIN32 AND CPU_ARCH_X64)
   target_sources(rcheevos PRIVATE