diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 0919b98514..a6c9d85775 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -79,6 +79,7 @@ set(CMAKE_REQUIRED_LIBRARIES %{CMAKE_DL_LIBS})
 check_function_exists("dladdr"           HAVE_DLADDR)
 cmake_pop_check_state()
 
+check_function_exists("floorl"           HAVE_FLOORL)
 check_function_exists("gethostbyname2"   HAVE_GETHOSTBYNAME2)
 check_function_exists("getopt"           HAVE_GETOPT)
 check_function_exists("getprotobynumber" HAVE_GETPROTOBYNUMBER)
diff --git a/cmakeconfig.h.in b/cmakeconfig.h.in
index 1303adbc7f..042816633f 100644
--- a/cmakeconfig.h.in
+++ b/cmakeconfig.h.in
@@ -66,6 +66,9 @@
 /* Define if GeoIP supports IPv6 (GeoIP 1.4.5 and later) */
 #cmakedefine HAVE_GEOIP_V6 1
 
+/* Define if you have the 'floorl' function. */
+#cmakedefine HAVE_FLOORL 1
+
 /* Define to 1 if you have the `gethostbyname2' function. */
 #cmakedefine HAVE_GETHOSTBYNAME2 1
 
@@ -284,6 +287,9 @@
 /* Define to 1 if you have the <string.h> header file. */
 #cmakedefine HAVE_STRING_H 1
 
+/* Define if you have the 'strptime' function. */
+#cmakedefine HAVE_STRPTIME 1
+
 /* Define if st_flags field exists in struct stat */
 #cmakedefine HAVE_ST_FLAGS 1
 
@@ -338,9 +344,6 @@
 /* Define if inet/v6defs.h needs to be included */
 #cmakedefine NEED_INET_V6DEFS_H 1
 
-/* Define if strptime.h needs to be included */
-#cmakedefine NEED_STRPTIME_H 1
-
 /* Name of package */
 #cmakedefine PACKAGE