diff --git a/dev-util/mercurial/mercurial-1.0.2-haiku.diff b/dev-util/mercurial/mercurial-1.0.2-haiku.diff
new file mode 100644
index 000000000..03ba71c96
--- /dev/null
+++ b/dev-util/mercurial/mercurial-1.0.2-haiku.diff
@@ -0,0 +1,24 @@
+diff -urN mercurial-1.0.2/mercurial/bdiff.c mercurial-1.0.2-haiku/mercurial/bdiff.c
+--- mercurial-1.0.2/mercurial/bdiff.c	2008-08-13 22:11:47.000000000 +0000
++++ mercurial-1.0.2-haiku/mercurial/bdiff.c	2008-09-09 15:43:50.000000000 +0000
+@@ -34,7 +34,7 @@
+ }
+ #else
+ #include <sys/types.h>
+-#ifdef __BEOS__
++#if defined __BEOS__ && !defined __HAIKU__
+ #include <ByteOrder.h>
+ #else
+ #include <arpa/inet.h>
+diff -urN mercurial-1.0.2/mercurial/mpatch.c mercurial-1.0.2-haiku/mercurial/mpatch.c
+--- mercurial-1.0.2/mercurial/mpatch.c	2008-08-13 22:11:47.000000000 +0000
++++ mercurial-1.0.2-haiku/mercurial/mpatch.c	2008-09-09 15:44:29.000000000 +0000
+@@ -52,7 +52,7 @@
+ #else
+ /* not windows */
+ # include <sys/types.h>
+-# ifdef __BEOS__
++# if defined __BEOS__ && !defined __HAIKU__
+ #  include <ByteOrder.h>
+ # else
+ #  include <arpa/inet.h>