$NetBSD: patch-dl,v 1.5 2014/11/30 08:40:51 spz Exp $

SunOS needs unistd.h for sysconf().

--- mono/utils/dlmalloc.c.orig	2017-08-02 13:16:42.000000000 +0000
+++ mono/utils/dlmalloc.c
@@ -1208,11 +1208,14 @@ int mspace_mallopt(int, int);
 #ifndef LACKS_UNISTD_H
 #include <unistd.h>     /* for sbrk */
 #else /* LACKS_UNISTD_H */
-#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) || !defined(__DragonFly__)
 extern void*     sbrk(ptrdiff_t);
 #endif /* FreeBSD etc */
 #endif /* LACKS_UNISTD_H */
 #endif /* HAVE_MMAP */
+#ifdef __sun
+#include <unistd.h> /* for sysconf */
+#endif
 
 #ifndef WIN32
 #ifndef malloc_getpagesize