While I'm trying gcc make linux-headers-`uname -r` I'm getting error

I was trying to install droidcam Linux client. when I run the command

gcc make linux-headers-`uname -r`

I'm getting the following error:

gcc: error: make: No such file or directorygcc: error: linux-headers-5.4.0-42-generic: No such file or directorygcc: fatal error: no input filescompilation terminated.

I tried

sudo apt-get install linux-headers-`uname -r`

and this tells me it is already there.

Reading package lists... DoneBuilding dependency tree       Reading state information... Donelinux-headers-5.4.0-42-generic is already the newest version (5.4.0-42.46).0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.