okay. nevermind!

source/vcpkg.json

@@ -2,7 +2,8 @@
   "$schema": "https://raw.githubusercontent.com/microsoft/vcpkg-tool/main/docs/vcpkg.schema.json",
   "dependencies": [
     "glew",
-    "sdl2",
+    { "name": "sdl2", "default-features": false, "features": ["wayland", "x11", "alsa"], "platform": "linux" },
+    { "name": "sdl2", "platform": "!linux" },
     "libvorbis",
     "zlib",
     "freetype",

triplets/x64-linux-mixed.cmake

@@ -9,11 +9,6 @@ if(PORT MATCHES "discord-")
     set(VCPKG_LIBRARY_LINKAGE dynamic)
 endif()
 
-if(PORT MATCHES "libsystemd")
-    set(VCPKG_C_FLAGS "${VCPKG_C_FLAGS} -std=c11")
-    set(VCPKG_CXX_FLAGS "${VCPKG_CXX_FLAGS}")
-endif()
-
 if(PORT MATCHES "opus")
   string(CONCAT VCPKG_CMAKE_CONFIGURE_OPTIONS
     "-DOPUS_INSTALL_PKG_CONFIG_MODULE=OFF"