Why do you need 1.14.x? 1.17.0 is way better

First you need to install git:
https://linuxhint.com/install-git-linux-mint/

Then you need to install the OpenModelica dependencies

for deb in deb deb-src; do echo "$deb http://build.openmodelica.org/apt `lsb_release -cs` nightly"; done | sudo tee /etc/apt/sources.list.d/openmodelica.list

wget -q http://build.openmodelica.org/apt/openmodelica.asc -O- | sudo apt-key add - 

sudo apt update

sudo apt build-dep openmodelica

Then you need to clone the OpenModelica repository and checkout that specific version:

cd ~

git clone https://github.com/OpenModelica/OpenModelica.git --recursive

cd OpenModelica

git checkout v1.14.2

git submodule update --force --init --recursive

Then you configure OpenModelica

cd ~/OpenModelica

autoconf

./configure 

Then you build the compiler and OMEdit:

cd ~/OpenModelica

# where NN is the number of cores your computer has

# if you have 4 cores write -j4 below

make -jNN

If all is fine you should have OpenModelica omc and OMEdit compiler in: ~/OpenModelica/build/
"~" is your home directory.

Then you need to install some Modelica libraries:

for PKG in `apt-cache search "omlib-.*" | cut -d" " -f1`; do sudo apt-get install -y "$PKG"; done

Then just start OMEdit in the terminal via:

~/OpenModelica/build/bin/OMEdit

Thanks for the directions!

It seems I am missing something from SUNDIALS when I build with make:

In file included from ./simulation/solver/kinsolSolver.c:70:
OpenModelicaBuild/OpenModelica/build/include/omc/c/sundials/kinsol/kinsol_klu.h:25:10: fatal error: kinsol/kinsol_sparse.h: No such file or directory
   25 | #include "kinsol/kinsol_sparse.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[3]: *** [Makefile.common:225: build/c/./simulation/solver/kinsolSolver.o] Error 1
make[3]: *** Waiting for unfinished jobs....
./simulation/solver/ida_solver.c:84:10: fatal error: idas/idas_klu.h: No such file or directory
   84 | #include <idas/idas_klu.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.

By the way, the configure step didn't give errors.

Ok, I need some more info.

# clean third party

cd ~/OpenModelica/OMCompiler/3rdParty

git clean -fdx

# build with trace

cd ~/OpenModelica/

make -j4 > trace.txt 2>&1

Then paste here the trace.txt.
kinsol is build from source in 3rdParty: OMCompiler\3rdParty\sundials
As far as I can tell sundials can't detect SuiteSparse build but I need the trace.txt to see exactly what the issue is.

Don't bother, I tried building this myself on Linux Mint 20.1 and found and issue. SuiteSparse has issues when linking, is missing -lm.

Please take the attached patch and patch the SuiteSparse cmake files.
SuiteSparse.zip
Download and unzip the SuiteSparse.patch and place it in OpenModelica/OMCompiler/3rdParty

cd ~/OpenModelica/OMCompiler/3rdParty

# patch SuiteSparse

patch < SuiteSparse.patch

# clean 3rdParty

git clean -fdx

# return to top OpenModelica directory

cd ~/OpenModelica/

make -j4

Let me know if this works.

Thank-you for looking into this. I will try this out once the dust settles here. Working toward a deadline.

Thank-you again for the help. Was able to build in a fresh VM with your patch and then copy out to my host. Something funny about building on the host.