https://bugs.gentoo.org/973648
https://github.com/PrismLauncher/PrismLauncher/pull/5523
https://github.com/PrismLauncher/PrismLauncher/pull/5524
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index c2f5e70cfc..375b4e5896 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -1569,8 +1569,10 @@ if (CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC")
     target_compile_options(Launcher_logic PRIVATE /wd4100) # C4100 - unused parameter
     target_compile_options(${Launcher_Name} PRIVATE /wd4100) # C4100 - unused parameter
 else()
-    target_compile_options(Launcher_logic PRIVATE -Wno-unused-parameter -Wno-missing-field-initializers)
-    target_compile_options(${Launcher_Name} PRIVATE -Wno-unused-parameter -Wno-missing-field-initializers)
+    # sfinae-incomplete is a new GCC warning and triggers in Qt headers
+    # no-unknown-warning-option so that compilers that don't have sfinae-incomplete don't error
+    target_compile_options(Launcher_logic PRIVATE -Wno-unused-parameter -Wno-missing-field-initializers -Wno-unknown-warning-option -Wno-sfinae-incomplete)
+    target_compile_options(${Launcher_Name} PRIVATE -Wno-unused-parameter -Wno-missing-field-initializers -Wno-unknown-warning-option -Wno-sfinae-incomplete)
 endif()
 
 #### The bundle mess! ####