system_lyxrc.viewer_alternatives.end();
for (; it != en; ++it) {
string const & fmt = it->first;
CommandSet const & cmd = it->second;
CommandSet::const_iterator sit = cmd.begin();
CommandSet::const_iterator const sen = cmd.end();
system_lyxrc.viewer_alternatives.end();
for (; it != en; ++it) {
string const & fmt = it->first;
CommandSet const & cmd = it->second;
CommandSet::const_iterator sit = cmd.begin();
CommandSet::const_iterator const sen = cmd.end();