diff --git a/config/config.h.in b/config/config.h.in
index 42b4ffc..5c30b03 100644
--- a/config/config.h.in
+++ b/config/config.h.in
@@ -1,5 +1,8 @@
 /* config/config.h.in.  Generated from configure.ac by autoheader.  */
 
+/* Define to 1 if you have the `alarm' function. */
+#undef HAVE_ALARM
+
 /* Define if you have clock_gettime() declared in <time.h> */
 #undef HAVE_CLOCK_GETTIME
 
@@ -51,6 +54,9 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the <lrand48> header file. */
+#undef HAVE_LRAND48
+
 /* Define to 1 if you have Lua headers and libraries */
 #undef HAVE_LUA
 
diff --git a/configure.ac b/configure.ac
index 3bdaafa..e2ae2a2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,6 +169,7 @@ AC_CHECK_DECL([clock_gettime],
 AC_SEARCH_LIBS([clock_gettime], [rt]) 
 
 AC_CHECK_FUNCS([ \
+alarm \
 directio \
 fdatasync \
 gettimeofday \