try debug/default.cfg -CONFIG_UCW_THREADS # non-threaded configuration
try debug/default.cfg -CONFIG_UCW_TLS # threaded, but no TLS support in gcc
try debug/default.cfg -CONFIG_UCW_EPOLL -CONFIG_UCW_MONOTONIC_CLOCK # without epoll and monotonic clock
try debug/default.cfg -CONFIG_UCW_THREADS # non-threaded configuration
try debug/default.cfg -CONFIG_UCW_TLS # threaded, but no TLS support in gcc
try debug/default.cfg -CONFIG_UCW_EPOLL -CONFIG_UCW_MONOTONIC_CLOCK # without epoll and monotonic clock