Myself and others new to mbed having trouble understanding the various arcane requirements. Adding a mbed_app.json file to enable a library feature instead of using a #define is one of them. Sharing this to help others.

Dependencies:   max32630fthr USBDevice

Revision:
3:601c11238ccb
Parent:
2:57500e991166
Child:
5:257f84271bc1
--- a/max32630fthr.lib	Thu Dec 08 00:06:59 2016 +0000
+++ b/max32630fthr.lib	Tue Dec 13 21:37:41 2016 +0000
@@ -1,1 +1,1 @@
-https://developer.mbed.org/users/switches/code/max32630fthr/#7a1d7d6d520e
+https://developer.mbed.org/users/switches/code/max32630fthr/#09e3dbb49561