for(const string &p: list_filtered(platforms_dir, "^android-[1-9][0-9]*$"))
{
unsigned api = lexical_cast<unsigned>(p.substr(8));
for(const string &p: list_filtered(platforms_dir, "^android-[1-9][0-9]*$"))
{
unsigned api = lexical_cast<unsigned>(p.substr(8));