[FreeBSD/10-current/clang/already fixed in ports tree]graphics/xv

compile on 10-current(clang), you need to add USE_GCC=any in Makefile(for ports/graphics/xv)
I will discuss this with maintaner.

[NOTES]
AT June/2013, I compiled all base system(from r251138) and ports tree.
I can compile freerdp without any changes.