mul should be mulq ... otherwise the build fails.  See downstream bug:
http://trac.macports.org/ticket/24002

The bug entered with this commit:

commit d8911f269faa235572b80a8a25b842b09df6e151
Author: Wim Taymans <wim.taymans@collabora.co.uk>
Date:   Fri Aug 28 12:43:43 2009 +0200

    utils: optimize for x86_64 with some inline asm
    
    64bit x86 has native 64x64->128 bit multiply that we can use with some inline
    assembler to speed up large multiplications.
    Use bsr to find the number of leading zeros more efficiently.


Here is the fix:

diff --git a/gst/gstutils.c b/gst/gstutils.c
index fc9339d..da32ca7 100644
--- a/gst/gstutils.c
+++ b/gst/gstutils.c
@@ -211,7 +211,7 @@ static inline void
 gst_util_uint64_mul_uint64 (GstUInt64 * c1, GstUInt64 * c0, guint64 arg1,
     guint64 arg2)
 {
-  __asm__ __volatile__ ("mul %3":"=a" (c0->ll), "=d" (c1->ll)
+  __asm__ __volatile__ ("mulq %3":"=a" (c0->ll), "=d" (c1->ll)
       :"a" (arg1), "g" (arg2)
       );
 }