by yargevad:

What steps will reproduce the problem?
http://play.golang.org/p/QL9XPbC_wf

What is the expected output?
Successful compilation

What do you see instead?
timeval.go:14[...]: cannot use tv.Sec (type int64) as type
_Ctype___darwin_time_t in assignment
timeval.go:15[...]: cannot use tv.Usec (type int32) as type
_Ctype___darwin_suseconds_t in assignment

Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?
OSX 10.7.5

Which version are you using?  (run 'go version')
$ go version
go version go1.0.3

Please provide any additional information below.
The example code provided is trivial and useless. That's the shortest way I know of to
illustrate what I'm seeing, even though that same functionality is available using the
syscall package. I'm integrating against a C library that has functions that take
'struct timeval's as parameters.