$OpenBSD: patch-coroutine_copy_Context_h,v 1.3 2021/04/09 14:43:07 sthen Exp $

Index: coroutine/copy/Context.h
--- coroutine/copy/Context.h.orig
+++ coroutine/copy/Context.h
@@ -12,7 +12,9 @@
 #include <setjmp.h>
 #include <string.h>
 #include <stdlib.h>
+#if defined(HAVE_ALLOCA_H)
 #include <alloca.h>
+#endif
 
 #define COROUTINE __attribute__((noreturn)) void
 
