diff --git a/devel/llvm13/files/patch-llvm_lib_CodeGen_TargetLoweringBase.cpp b/devel/llvm13/files/patch-llvm_lib_CodeGen_TargetLoweringBase.cpp
new file mode 100644
index 000000000000..0323f6d7a13b
--- /dev/null
+++ b/devel/llvm13/files/patch-llvm_lib_CodeGen_TargetLoweringBase.cpp
@@ -0,0 +1,15 @@
+--- llvm/lib/CodeGen/TargetLoweringBase.cpp.orig	2021-09-24 16:18:10 UTC
++++ llvm/lib/CodeGen/TargetLoweringBase.cpp
+@@ -1980,8 +1980,11 @@ void TargetLoweringBase::insertSSPDeclarations(Module 
+     auto *GV = new GlobalVariable(M, Type::getInt8PtrTy(M.getContext()), false,
+                                   GlobalVariable::ExternalLinkage, nullptr,
+                                   "__stack_chk_guard");
++
++    // FreeBSD has "__stack_chk_guard" defined externally on libc.so
+     if (TM.getRelocationModel() == Reloc::Static &&
+-        !TM.getTargetTriple().isWindowsGNUEnvironment())
++        !TM.getTargetTriple().isWindowsGNUEnvironment() &&
++        !TM.getTargetTriple().isOSFreeBSD())
+       GV->setDSOLocal(true);
+   }
+ }