Andrea, you are right that libaom and libwebp are already in the thirdparty builds. There are some people out there who are doing "unbundled builds" who would need to either add them or realize that these new capabilities in Cin will not be available

libusb 1.0.22 (dev?)

libusb has to be at least 1.x.x and must be DEV or DEVEL because it needs the headers

libtool instead of libtoolize

Yes

aom instead of libaom

and Yes

With regard to aom, I noticed that during compilation there is a
slowdown of a few tens of seconds while processing strings that
contain libaom. Nothing serious, everything goes on normally. Is it
normal?

GG says this does happen with some of the thirdparty libraries compiles and is normal. Often it is because they are compiling assembly code. One time he looked at the x265 library and found 50,000 lines of assembly code (impressive).