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:
9:29f7bb957c34
Parent:
8:d2b660bf5f94
--- a/USBDevice.lib	Thu Nov 16 21:27:19 2017 +0000
+++ b/USBDevice.lib	Fri Apr 05 01:44:50 2019 +0000
@@ -1,1 +1,1 @@
-https://developer.mbed.org/teams/MaximIntegrated/code/USBDevice/#17ac7abb27a7
+https://developer.mbed.org/teams/MaximIntegrated/code/USBDevice/#dad310740b28