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This patch is incorrect. On your system, I believe,
inet_addr does not return int, but in_addr_t. Therefore, you
should write an autoconf test that tests whether in_addr_t
is available on the system. If the type is not available,
check whether unsigned long int has size 4. If it doesn't,
check whether unsigned int has size 4. Of these three types,
use the first one that matches; generate an #error if you
can't find a suitable type.