diff -up mono-4.8.0/mono/utils/mono-sigcontext.h.than mono-4.8.0/mono/utils/mono-sigcontext.h
--- mono-4.8.0/mono/utils/mono-sigcontext.h.than	2017-09-20 09:47:02.344226028 -0400
+++ mono-4.8.0/mono/utils/mono-sigcontext.h	2017-09-20 09:53:16.120785421 -0400
@@ -276,7 +276,7 @@ typedef struct ucontext {
 #endif
 
 #if defined(__linux__)
-	typedef struct ucontext os_ucontext;
+	typedef ucontext_t os_ucontext;
 
 #ifdef __mono_ppc64__
 	#define UCONTEXT_REG_Rn(ctx, n)   (((os_ucontext*)(ctx))->uc_mcontext.gp_regs [(n)])
diff -up mono-4.8.0/mono/utils/mono-context.h.than mono-4.8.0/mono/utils/mono-context.h
--- mono-4.8.0/mono/utils/mono-context.h.than	2017-09-20 17:34:46.343187526 +0200
+++ mono-4.8.0/mono/utils/mono-context.h	2017-09-20 17:35:18.324985280 +0200
@@ -854,7 +854,7 @@ typedef struct {
 
 #define MONO_ARCH_HAS_MONO_CONTEXT 1
 
-typedef struct ucontext MonoContext;
+typedef ucontext_t MonoContext;
 
 #define MONO_CONTEXT_SET_IP(ctx,ip) 					\
 	do {								\