Makefile.PL does not detect epoll support on Debian 7+: $ perl Makefile.PL ... Enable epoll backend (y/n)? [n] n The reason for this is that Makefile.pl checks for the existence of /usr/include/sys/epoll.h to decide if support exists. Debian however does not have that file, because it installs many of headers and libraries in architecture-specific dirs so it can support multiple architectures sanely. dpkg -S sys/epoll.h libc6-dev:amd64: /usr/include/x86_64-linux-gnu/sys/epoll.h A naive fix would be to check for /usr/include/*/sys/epoll.h, or to compute the architecture name and build a path from there. A really nice fix would be to use the compiler to test for the header (ala autoconf) but I know that can be tough to get right across platforms. (I know there's a workaround via the EV_EPOLL environment variable, but that doesn't help the defaults).
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