Looks:~/.cpan/build/IO-AIO-3.05 # make cc -c -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include -D_LARGEFILE_ +SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DVERSION=\"3.05\" -DXS_VERSION=\"3.05\" -fpic "-I/usr/local/l +ib/perl5/5.8.8/i686-linux/CORE" AIO.c In file included from AIO.xs:112: libeio/eio.c: In function ??tp_atfork_prepare?? libeio/eio.c:317: error: ??readwritelock??undeclared (first use in this function) libeio/eio.c:317: error: (Each undeclared identifier is reported only once libeio/eio.c:317: error: for each function it appears in.) libeio/eio.c: In function ??tp_atfork_parent?? libeio/eio.c:324: error: ??readwritelock??undeclared (first use in this function) make: *** [AIO.o] Error 1