[GNC] Trouble building 5.3

[Simon Roberts]

Hi all, I'm looking to build GNC 5.3 on my Ubuntu 20.04 box. I did this as
a trial run on a laptop with Ubuntu 22.04, where it went flawlessly. But,
on this 20.04 "production" machine, the same process is failing. I don't
want to upgrade this at this time if I can help it--it would disturb too
many other things that are working smoothly.

I did this:

$ sudo apt-get build-dep gnucash
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 191 not upgraded.

(I'm not sure why it installed nothing, I don't think I built GNC on this
before)
But then when I run the cmake process with:

$ cmake -DCMAKE_INSTALL_PREFIX=${HOME}/gnucash5.3 gnucash-5.3/

It progresses a while before reporting:

-- Checking for module 'gwenhywfar>=5.6.0'
--   Requested 'gwenhywfar >= 5.6.0' but version of gwenhywfar is 5.1.3
CMake Error at /usr/share/cmake-3.16/Modules/FindPkgConfig.cmake:463
(message):
  A required package was not found

At the risk of stating the obvious, it seems I have the older version:

$ sudo apt list libgwenhywfar\*
Listing... Done
libgwenhywfar-core-dev/focal,now 5.1.3-1build1 amd64 [installed,automatic]
libgwenhywfar-data/focal,focal,now 5.1.3-1build1 all [installed,automatic]
libgwenhywfar-doc/focal,focal 5.1.3-1build1 all
libgwenhywfar79-dev/focal 5.1.3-1build1 amd64
libgwenhywfar79/focal,now 5.1.3-1build1 amd64 [installed]

And it doesn't seem that 20.04 is willing to upgrade this.

Am I toast? Do I have to have Ubuntu 22.04 if I am to build this
successfully? Or can anyone offer a workaround (e.g. is it perhaps
practical to build the newer version of this library by hand?)

Thanks for any ideas!
Cheers,
Simon

-- 
Simon Roberts
(303) 249 3613