diff --git a/math/oink/files/patch-src_lace.h b/math/oink/files/patch-src_lace.h
new file mode 100644
index 000000000000..86d901ac1df4
--- /dev/null
+++ b/math/oink/files/patch-src_lace.h
@@ -0,0 +1,14 @@
+--- src/lace.h.orig	2021-07-12 11:27:04 UTC
++++ src/lace.h
+@@ -293,7 +293,11 @@ void lace_yield(WorkerP *__lace_worker, Task *__lace_d
+ #endif
+ 
+ #ifndef mfence
++#ifdef __amd64__
+ #define mfence() { asm volatile("mfence" ::: "memory"); }
++#elif defined(__powerpc__)
++#define mfence() { asm volatile("sync" ::: "memory"); }
++#endif
+ #endif
+ 
+ /* Compiler specific branch prediction optimization */