diff --git a/srcpkgs/freeorion/patches/fix-cflags.patch b/srcpkgs/freeorion/patches/fix-cflags.patch
new file mode 100644
index 0000000000..c66d545995
--- /dev/null
+++ b/srcpkgs/freeorion/patches/fix-cflags.patch
@@ -0,0 +1,18 @@
+Index: CMakeLists.txt
+===================================================================
+--- CMakeLists.txt.orig
++++ CMakeLists.txt
+@@ -432,13 +432,6 @@ if(MSVC)
+     )
+ endif()
+ 
+-target_compile_options(freeorionparseobj
+-    PRIVATE
+-        $<$<CXX_COMPILER_ID:Clang>:-ftemplate-depth=512>
+-        $<$<CXX_COMPILER_ID:AppleClang>:-ftemplate-depth=512>
+-        $<$<AND:$<NOT:$<BOOL:${BUILD_TESTING}>>,$<CXX_COMPILER_ID:GNU>>:-O3>
+-)
+-
+ target_compile_definitions(freeorionparseobj
+     PUBLIC
+         -DBOOST_ALL_DYN_LINK