A blank line, like this:
 
X201T:~> pkg-config libffi --cflags
 
X201T:~>


On Thu, Nov 20, 2014 at 7:11 PM, Luís Oliveira <luismbo@gmail.com> wrote:
On Thu, Nov 20, 2014 at 6:36 PM, Liam Healy <lnp@healy.washington.dc.us> wrote:
> ; pkg-config libffi --cflags

What does this command return on your system?

--
Luís Oliveira
http://kerno.org/~luis/