--- a/cdr/cdr_radius.c	2013-12-11 10:08:13.537159711 +0100
+++ b/cdr/cdr_radius.c	2013-12-11 10:08:13.529159762 +0100
@@ -36,7 +36,11 @@
 
 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328259 $")
 
+#ifdef FREERADIUS_CLIENT
+#include <freeradius-client.h>
+#else
 #include <radiusclient-ng.h>
+#endif
 
 #include "asterisk/channel.h"
 #include "asterisk/cdr.h"
@@ -82,7 +86,11 @@
 static const char name[] = "radius";
 static const char cdr_config[] = "cdr.conf";
 
+#ifdef FREERADIUS_CLIENT
+static char radiuscfg[PATH_MAX] = "/etc/radiusclient/radiusclient.conf";
+#else
 static char radiuscfg[PATH_MAX] = "/etc/radiusclient-ng/radiusclient.conf";
+#endif
 
 static struct ast_flags global_flags = { RADIUS_FLAG_USEGMTIME | RADIUS_FLAG_LOGUNIQUEID | RADIUS_FLAG_LOGUSERFIELD };
 
--- a/cel/cel_radius.c	2013-12-11 10:08:13.537159711 +0100
+++ b/cel/cel_radius.c	2013-12-11 10:08:13.529159762 +0100
@@ -35,7 +35,11 @@
 
 ASTERISK_FILE_VERSION(__FILE__, "$Rev: 328259 $")
 
+#ifdef FREERADIUS_CLIENT
+#include <freeradius-client.h>
+#else
 #include <radiusclient-ng.h>
+#endif
 
 #include "asterisk/channel.h"
 #include "asterisk/cel.h"
@@ -79,7 +83,11 @@
 
 static char *cel_config = "cel.conf";
 
+#ifdef FREERADIUS_CLIENT
+static char radiuscfg[PATH_MAX] = "/etc/radiusclient/radiusclient.conf";
+#else
 static char radiuscfg[PATH_MAX] = "/etc/radiusclient-ng/radiusclient.conf";
+#endif
 
 static struct ast_flags global_flags = { RADIUS_FLAG_USEGMTIME | RADIUS_FLAG_LOGUNIQUEID | RADIUS_FLAG_LOGUSERFIELD };
 
--- a/configure.ac	2013-12-11 10:08:13.537159711 +0100
+++ b/configure.ac	2013-12-11 10:11:02.420053317 +0100
@@ -2103,7 +2103,14 @@
 # Some distributions (like SuSE) remove the 5.1 suffix.
 AST_EXT_LIB_CHECK([LUA], [lua], [luaL_register], [lua.h], [-lm])
 
-AST_EXT_LIB_CHECK([RADIUS], [radiusclient-ng], [rc_read_config], [radiusclient-ng.h])
+# Accept either RADIUS client library, their APIs are fully compatible,
+# just different header filenames and different SONAMEs
+AST_EXT_LIB_CHECK([RADIUS], [freeradius-client], [rc_read_config], [freeradius-client.h])
+if test "x${PBX_RADIUS}" = "x1"; then
+	AC_DEFINE(FREERADIUS_CLIENT, [], [Use the FreeRADIUS-client library])
+else
+	AST_EXT_LIB_CHECK([RADIUS], [radiusclient-ng], [rc_read_config], [radiusclient-ng.h])
+fi
 
 AST_EXT_LIB_CHECK([COROSYNC], [cpg], [cpg_join], [corosync/cpg.h], [-lcfg])
 AST_EXT_LIB_CHECK([COROSYNC_CFG_STATE_TRACK], [cfg], [corosync_cfg_state_track], [corosync/cfg.h], [-lcfg])