Fix build with JSON support enabled

--- a/configure.ac
+++ b/configure.ac
@@ -62,7 +62,7 @@ Please install libjson to continue.
 ----------------------------------------])
     fi
 
-    AC_CHECK_HEADER([json/json.h],,[AC_MSG_ERROR([
+    AC_CHECK_HEADER([json-c/json.h],,[AC_MSG_ERROR([
 ----------------------------------------
 Macaroons rely upon the libjson library.
 Please install libjson to continue.
diff --git a/macaroons.c b/macaroons.c
index ab296c8..654edfc 100644
--- a/macaroons.c
+++ b/macaroons.c
@@ -32,12 +32,17 @@
 
 /* C */
 #include <assert.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
 
+#define TRUE true
+#define FALSE false
+
 /* json */
 #ifdef MACAROONS_JSON_SUPPORT
-#include <json/json.h>
+#include <json-c/json.h>
+#include <json-c/json_object.h>
 #endif
 
 /* macaroons */
--