dnl Checks for library functions.
AC_TYPE_SIGNAL
-AC_CHECK_FUNCS([asprintf fchmod fork gettimeofday random select setns strdup usleep getifaddrs],
+AC_CHECK_FUNCS([asprintf fchmod fork gettimeofday random select setns strdup usleep getifaddrs freeifaddrs],
[], [], [#include "$srcdir/src/have.h"]
)