diff --git a/configure.ac b/configure.ac
index 56cc580..0b8785a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -93,7 +93,7 @@ AS_IF([test x"$with_skalibs" != xno],
    AC_SUBST([STDDJB_LDFLAGS], ["$SKALIBS_LDFLAGS -lstddjb"])])
 
 # Checks for header files.
-AC_CHECK_HEADERS([arpa/inet.h curses.h fcntl.h langinfo.h limits.h locale.h netinet/in.h pty.h stddef.h stdint.h stdlib.h string.h sys/ioctl.h sys/socket.h sys/time.h term.h termios.h unistd.h util.h wchar.h wctype.h])
+AC_CHECK_HEADERS([arpa/inet.h curses.h fcntl.h langinfo.h limits.h locale.h netinet/in.h pty.h stddef.h stdint.h stdlib.h string.h sys/ioctl.h sys/resource.h sys/socket.h sys/time.h term.h termios.h unistd.h util.h wchar.h wctype.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_HEADER_STDBOOL
@@ -113,7 +113,7 @@ AC_FUNC_FORK
 AC_FUNC_MALLOC
 AC_FUNC_MBRTOWC
 AC_FUNC_REALLOC
-AC_CHECK_FUNCS([gettimeofday inet_ntoa iswprint memchr memset nl_langinfo setenv setlocale sigaction socket strchr strdup strerror strtol wcwidth])
+AC_CHECK_FUNCS([gettimeofday setrlimit inet_ntoa iswprint memchr memset nl_langinfo setenv setlocale sigaction socket strchr strdup strerror strtol wcwidth])
 
 AC_SEARCH_LIBS([clock_gettime], [rt], [AC_DEFINE([HAVE_CLOCK_GETTIME], [1], [Define if clock_gettime is available.])])