diff -Naur postgis-2.4.2.old/liblwgeom/lwin_geojson.c postgis-2.4.2/liblwgeom/lwin_geojson.c
--- postgis-2.4.2.old/liblwgeom/lwin_geojson.c	2017-12-21 22:52:40.422802160 +0100
+++ postgis-2.4.2/liblwgeom/lwin_geojson.c	2017-12-21 22:55:36.605430945 +0100
@@ -31,13 +31,19 @@
 
 #if defined(HAVE_LIBJSON) || defined(HAVE_LIBJSON_C) /* --{ */
 
+#define JSON_C_VERSION_013 (13 << 8)
+
 #ifdef HAVE_LIBJSON_C
 #include <json-c/json.h>
+#if !defined(JSON_C_VERSION_NUM) || JSON_C_VERSION_NUM < JSON_C_VERSION_013
 #include <json-c/json_object_private.h>
+#endif
 #else
 #include <json/json.h>
+#if !defined(JSON_C_VERSION_NUM) || JSON_C_VERSION_NUM < JSON_C_VERSION_013
 #include <json/json_object_private.h>
 #endif
+#endif
 
 #ifndef JSON_C_VERSION
 /* Adds support for libjson < 0.10 */