On Linux, <uuid/uuid.h> and related functions are provided by the util-linux-ng
package, which doesn't build on other operating systems, such as MacOS X. That
platform provides libuuid as part of the system. Hence, to build libSM on
MacOS, we define (empty) variables LIBUUID_CFLAGS and LIBUUID_CFLAGS. Those
settings disable ./configure's attempt to detect libuuid with pkgconfig --
which would fail.
svn path=/nixpkgs/trunk/; revision=17600
abe32ecf99