diff -urp mono-6.8.0.123.orig/mono/utils/mono-context.h mono-6.8.0.123/mono/utils/mono-context.h
--- mono-6.8.0.123.orig/mono/utils/mono-context.h	2020-05-11 12:58:14.000000000 -0500
+++ mono-6.8.0.123/mono/utils/mono-context.h	2020-05-21 15:10:03.209484526 -0500
@@ -879,7 +879,7 @@ typedef struct {
 
 #include <sys/ucontext.h>
 
-#if __GLIBC_PREREQ(2, 27)
+#if __GLIBC_PREREQ(2, 26)
 typedef ucontext_t MonoContext;
 #else
 typedef struct ucontext MonoContext;