We don't test against build, host or target so there's no need for these.

Also added -v/--version flag

yaml-0.1 pkg-config file is fairly new, might not be present

Check return codes of calls to system

Override by settings CXXFLAGS variable

sflphone-common -> daemon
sflphone-client-gnome -> gnome
sflphone-client-kde -> kde
sflphone-plugins -> plugins

It is packaged in most distributions

use AC_DEFINE_UNQUOTED to perform shell expansion
Do not use USE_IAX in code, it's makefile only
Always define HAVE_IAX to 0 or 1 (1 if enabled)