diff --git a/configure.ac b/configure.ac
index d1f3573fa29b3e9ae9e8abfa81067a79c1188d88..129a8eff940e78a2b302cf4486e22e8806739156 100644
--- a/configure.ac
+++ b/configure.ac
@@ -93,7 +93,7 @@ AC_TYPE_UINT8_T
 # Checks for library functions.
 AC_FUNC_FORK
 AC_FUNC_MMAP
-AC_CHECK_FUNCS([gethostbyname gettimeofday memmove memset munmap regcomp select socket sqrt strcasecmp strchr strdup strerror strncasecmp strtol strtoul])
+AC_CHECK_FUNCS([gethostbyname gettimeofday memmove memset munmap regcomp select socket sqrt strcasecmp strchr strdup strerror strncasecmp strtol strtoul poll epoll_wait kqueue])
 
 AC_CONFIG_FILES([Makefile
                  libknot/Makefile