build CHANGE look for json-c package rather than json
diff --git a/configure.ac b/configure.ac
index f2698e1..bd51d41 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,7 +53,7 @@
 # save clean LIBS and CFLAGS
 SAVEDTEMP_LIBS=$LIBS
 SAVEDTEMP_CFLAGS=$CFLAGS
-PKG_CHECK_MODULES([json], [json])
+PKG_CHECK_MODULES([json], [json-c])
 PKG_CHECK_MODULES([netconf2], [libnetconf2])
 PKG_CHECK_MODULES([yang], [libyang])
 AX_PTHREAD([CC="$PTHREAD_CC"], [AC_MSG_ERROR([pthread not found])])