At least since https://bitbucket.org/portix/dwb/commits/a6676d885762a19f5a8e3ee9d46ccd923e33a1d6 dwb needs json-c: https://bitbucket.org/portix/dwb/src/tip/INSTALL#cl-14 Without it installed compilation fails with: config.mk:111: *** Cannot find json-c. Stop.
Fixed in CVS.