Linux Mint depext packages

The depext packages are for Linux Mint 19 Tara:

libgmp-dev
libgtk2.0-dev
libgtksourceview2.0-dev
libgnomecanvas2-dev

Possibly useful information according to depext: arch=x86_64, os=linux, os-distribution=linuxmint, os-family=ubuntu

I believe these packages are the same as Ubuntu's, but I haven't validated this.

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