Installation error - node-waf not found

[whiteduck22]

Hello - found an error on up to date raspberry pi (buster) when installing.

$ node -v
v10.24.1
$ npm -v
6.14.12

Thanks a lot

pi@raspberrypi:~ $ sudo npm install mqtt-exec -g
npm WARN deprecated exec@0.0.5: deprecated in favor of builtin child_process.execFile

> sleep@1.1.0 preinstall /usr/local/lib/node_modules/mqtt-exec/node_modules/sleep
> node build.js


/bin/sh: 1: node-waf: not found
/bin/sh: 1: node-waf: not found

/usr/local/bin/mqtt-exec -> /usr/local/lib/node_modules/mqtt-exec/mqtt-exec.js
+ mqtt-exec@1.0.0
added 94 packages from 61 contributors in 63.001s