mpir v gmp and problems building for Qt6

[Jack Ostroff]

Merry Christmas to all.

In bits of spare time, I've been trying to compile libalkimia and 
kmymoney for Qt6.  I was having some difficulties getting them to find 
mpir.  While digging into the details of why, as I read the code, I see 
KMyMoney prefers MPIR to GMP (from CMakeLists.txt) since 6 years ago.  
Wikipedia (https://en.wikipedia.org/wiki/MPIR_(mathematics_software)) 
mentions that "According to the MPIR-devel mailing list, "MPIR is no 
longer maintained" with a link to 
https://groups.google.com/g/mpir-devel/c/qTOaOBuS2E4/m/_8AQjEieAAAJ?pli=1 
which includes "MPIR is no longer maintained for years now." from a post 
from 23 Dec 2021.  Given this, is there any reason to continue our 
preference from mpir over mgp?

Back to the code, without mpir installed, libalkimia seems to find gmp 
with no problem, but fails later in cmake (which I'll discuss in a 
separate thread.)  However, running cmake for KMyMoney, I get:

CMake Error at 
/usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package):
  By not providing "FindGMP.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "GMP", but
  CMake did not find one.

  Could not find a package configuration file provided by "GMP" with any of
  the following names:

    GMPConfig.cmake
    gmp-config.cmake

  Add the installation prefix of "GMP" to CMAKE_PREFIX_PATH or set 
"GMP_DIR"
  to a directory containing one of the above files.  If "GMP" provides a
  separate development package or SDK, be sure it has been installed.
Call Stack (most recent call first):
  /home/jack/KDE/KMM/libalkimia/build6/src/LibAlkimia6Config.cmake:31 
(find_dependency)
  CMakeLists.txt:216 (find_package)

I can find neither GMPConfig.cmake nor gmp-config.cmakeanywhere on my 
system, but I do have  pkgconfig files gmp.pc and gmpxx.pc. So - why can 
libalkimia find it but not kmymoney?  I have cmake 3.31.3 installed.  Is 
my system somehow misconfigured, or have I missed something?

Thanks for any suggestions.

Jack