diff --git a/autotools/m4/phpjson.m4 b/autotools/m4/phpjson.m4
new file mode 100644
index 000000000..32fc6bc2a
--- /dev/null
+++ b/autotools/m4/phpjson.m4
@@ -0,0 +1,17 @@
+#
+# This macro test for php-json (used by webgui)
+#
+AC_DEFUN([AX_PHPJSON_CHECK],
+[
+	chkfile="/usr/lib64/php/modules/json.so"
+
+	AC_CHECK_FILE([$chkfile],
+	[
+	], [
+		AC_MSG_WARN(***********************************************)
+		AC_MSG_WARN(php-json not found under $chkfile)
+		AC_MSG_WARN(webgui will build however it may fail to render)
+		AC_MSG_WARN(graphs yum install php-json?)
+		AC_MSG_WARN(***********************************************)
+	])
+])
diff --git a/configure.ac b/configure.ac
index 367d93312..e05923ae3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -128,6 +128,12 @@ AX_ENABLE_FLAG([gprof], [test only: add gprof info to the binaries], [-g -pg])
 AX_ENABLE_FLAG([gcov], [test only: add gcov info to the binaries], [--coverage])
 AX_VALGRIND_CHECK
 
+#
+# Check for php-json
+#
+AX_PHPJSON_CHECK
+
+
 # behavior flags
 AX_DISABLE_FLAG([atfunc], [Don't use 'at' functions for scanning], [-D_NO_AT_FUNC])