Problem building RTEMS - readline/undefined reference to tputs

[John Graham]

> Did you install the packages listed here:
>
> https://docs.rtems.org/branches/master/user/hosts/posix.html#xubuntu
>
> sudo apt-get build-dep gcc-defaults g++ gdb git unzip pax bison \
>         flex libpython-dev git libncurses5-dev zlib1g-dev

It can't find build-dep or gcc-defaults - any idea if this is because
I'm on 19.04 or if the package name isn't quite right?