libc 2.7 - function implemented and not defined

[Tom]

Hi

There may be a bug in ubuntu hardy libc version (libc2.7)
eventfd function appears to be implemented, but not defined.
I am building a software (vlc) which uses Autotools and :
AC_CHECK_FUNCS(eventfd) is successfull but AC_CHECK_HEADERS(sys/eventfd.h) is not
This means this libc implements eventfd() but does not declare it anywhere.
Should I fill a bug report about that or contact the maintainer ?

thanks