my $h = "include/curl/curl.h";
open H_IN, "-|", "cpp", $h;
while ( <H_IN> ) {
        if ( /enum\s+(\S+\s+)?{/ .. /}/ ) {
                s/^\s+//;
                next unless /^CURL/;
                chomp;
                s/[,\s].*//;
                print $_ . "\n";
        }
}