3.9 Setup for OOT development

I am planning to update an OOT module I wrote 4 years ago. I setup a laptop with a fresh install of Ubuntu 20.04 to use for development. I installed GNU Radio 3.8, but then I decided to go with 3.9, so I removed 3.8, and installed 3.9 from the PPA. Then I ran

modtool newmod streamx ...

cd streamx

modtool add ...

modtool  bind ...

and then tried

mkdir build

cd build

cmake ../

I didn't have cmake, so I installed that, and then doxygen, and then some others. Still getting errors so I installed ALL the dependencies for building GNU Radio as described here https://wiki.gnuradio.org/index.php/UbuntuInstall#Focal_Fossa_.2820.04.29. 

I'm still getting the following errors from cmake

<...>

-- Checking for module 'mpir >= 3.0'

--   No package 'mpir' found

-- Could NOT find MPIR (missing: MPIRXX_LIBRARY MPIR_LIBRARY MPIR_INCLUDE_DIR)

<...>

-- Python checking for pygccxml - not found
<...>

CMake Error in lib/CMakeLists.txt:

  Imported target "gnuradio::gnuradio-runtime" includes non-existent path

    "/include"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

So, do I need mpir and pygccxml? If yes, where to find them and how to install?

How do I investigate the missing /include? I can see the include directory in my new streamx module, it's exactly where modtool put it.

Thanks,

Gavin

UbuntuInstall - GNU Radio Building GNU Radio on Ubuntu Linux []. GNU Radio works well on all Ubuntu versions from 10.04 upward. It is also possible to install GNU Radio on older releases of Ubuntu (see #Building_GNU_Radio_on_Legacy_Ubuntu).However, we may not be able to provide sufficient support for legacy OS. wiki.gnuradio.org

InstallingGR - GNU Radio From Binaries []. The recommended way to install GNU Radio on most platforms is using already available binary packages (see Ubuntu PPA Installation).For some platforms there are no binaries provided by available package managers or the GNU Radio project. wiki.gnuradio.org