1. Contents of set-env-var.x file:

export OPENMM_PLUGIN_DIR=/home/rossi/miniconda3/lib/plugins/
export OPENMM_LIBRARY=/home/rossi/miniconda3/lib/
export OPENMM_INCLUDE_DIR=/home/rossi/miniconda3/include/
export OPENMM_HOME=/home/rossi/miniconda3/
export OPENMM_DIR=/home/rossi/miniconda3/

2. Execute the set-env-var.x file to define OPENMM environment variables:

source  ./set-env-var.x

3. Check for defined OPENMM envrionment variables:

(base) Thu Jan 06 09:19:26 [rossi@debian charmm-build-openmm]$env | grep OPENMM
OPENMM_DIR=/home/rossi/miniconda3/
OPENMM_LIBRARY=/home/rossi/miniconda3/lib/
OPENMM_PLUGIN_DIR=/home/rossi/miniconda3/lib/plugins/
OPENMM_INCLUDE_DIR=/home/rossi/miniconda3/include/
OPENMM_HOME=/home/rossi/miniconda3/

4. ../configure

=====
WARNING install prefix not specified
depending on your system, executing make install
may result in directories being written to /usr/local
or somewhere similar
=====
configuration using cmake continues using
env /usr/bin/cmake /home/rossi/Downloads/workshop/charmm/c46b1

after configuration run make in
    /home/rossi/Downloads/workshop/charmm/c46b1/charmm-build-openmm
to compile and link the charmm executable
=====
-- The C compiler identification is GNU 11.2.0
-- The CXX compiler identification is GNU 11.2.0
-- The Fortran compiler identification is GNU 11.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Detecting Fortran compiler ABI info
-- Detecting Fortran compiler ABI info - done
-- Check for working Fortran compiler: /usr/bin/gfortran - skipped
-- Found FFTW: /usr/include
-- Found FFTWF: /usr/lib/x86_64-linux-gnu/libfftw3f.so
-- Found MPI_C: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so (found version "3.1")
-- Found MPI_CXX: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi_cxx.so (found version "3.1")
-- Found MPI_Fortran: /usr/lib/x86_64-linux-gnu/libmpi_usempif08.so (found version "3.1")
-- Found MPI: TRUE (found version "3.1")
-- Found OpenMP_C: -fopenmp (found version "4.5")
-- Found OpenMP_CXX: -fopenmp (found version "4.5")
-- Found OpenMP_Fortran: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- Found OpenMP_Fortran: -fopenmp
-- OpenMM : FOUND OPENMM_INCLUDE_DIRS ->/home/rossi/miniconda3/include<-
-- OpenMM : FOUND OPENMM_LIBRARIES ->/usr/lib/x86_64-linux-gnu/libOpenMM.so<-
-- OpenMM : FOUND OPENMM_PLUGIN_DIR ->/home/rossi/miniconda3/lib/plugins<-
-- OpenMM : FOUND OPENMM_CPU_PLUGIN ->/home/rossi/miniconda3/lib/plugins/libOpenMMCPU.so<-
-- OpenMM : FOUND OPENMM_CUDA_PLUGIN ->/home/rossi/miniconda3/lib/plugins/libOpenMMCUDA.so<-
-- OpenMM : FOUND OPENMM_OPENCL_PLUGIN ->/home/rossi/miniconda3/lib/plugins/libOpenMMOpenCL.so<-
-- Found OpenMM: /home/rossi/miniconda3/include
-- Could NOT find ExaFMM (missing: ExaFMM_LIBRARY)
-- Could NOT find CUDA (missing: CUDA_TOOLKIT_ROOT_DIR CUDA_NVCC_EXECUTABLE CUDA_INCLUDE_DIRS CUDA_CUDART_LIBRARY)
-- found OPENMM flags ->  <-
-- OpenMM version detected ->76<-
-- OpenCL not found
-- full build chosen
-- Configuring done
-- Generating done
-- Build files have been written to: /home/rossi/Downloads/workshop/charmm/c46b1/charmm-build-openmm
=====
you are now ready to run make in
    /home/rossi/Downloads/workshop/charmm/c46b1/charmm-build-openmm
=====

5. Execute make;  The result is a lot of un resolved references to openmm:

...... snip .....

/usr/bin/ld: omm_switching.F90:(.text+0x1d71): undefined reference to `openmm_system_addforce_'
/usr/bin/ld: omm_switching.F90:(.text+0x1dc0): undefined reference to `openmm_doublearray_create_'
/usr/bin/ld: omm_switching.F90:(.text+0x1eee): undefined reference to `openmm_customnonbondedforce_addparticle_'
/usr/bin/ld: omm_switching.F90:(.text+0x207b): undefined reference to `openmm_doublearray_destroy_'
/usr/bin/ld: omm_switching.F90:(.text+0x2276): undefined reference to `openmm_custombondforce_create_'
/usr/bin/ld: omm_switching.F90:(.text+0x22bc): undefined reference to `openmm_custombondforce_addglobalparameter_'
/usr/bin/ld: omm_switching.F90:(.text+0x22e9): undefined reference to `openmm_custombondforce_addglobalparameter_'
/usr/bin/ld: omm_switching.F90:(.text+0x238d): undefined reference to `openmm_custombondforce_addperbondparameter_'
/usr/bin/ld: omm_switching.F90:(.text+0x23e0): undefined reference to `openmm_system_addforce_'
/usr/bin/ld: omm_switching.F90:(.text+0x2706): undefined reference to `openmm_customnonbondedforce_getenergyfunction_'
/usr/bin/ld: omm_switching.F90:(.text+0x27af): undefined reference to `openmm_custombondforce_getenergyfunction_'
/usr/bin/ld: omm_switching.F90:(.text+0x285a): undefined reference to `openmm_custombondforce_getnumglobalparameters_'
/usr/bin/ld: omm_switching.F90:(.text+0x28dc): undefined reference to `openmm_custombondforce_getnumperbondparameters_'
/usr/bin/ld: omm_switching.F90:(.text+0x295e): undefined reference to `openmm_custombondforce_getnumbonds_'
/usr/bin/ld: omm_switching.F90:(.text+0x2b32): undefined reference to `openmm_doublearray_create_'
/usr/bin/ld: omm_switching.F90:(.text+0x2f5d): undefined reference to `openmm_customnonbondedforce_addexclusion_'
/usr/bin/ld: omm_switching.F90:(.text+0x30f3): undefined reference to `openmm_custombondforce_addbond_'
/usr/bin/ld: omm_switching.F90:(.text+0x335b): undefined reference to `openmm_customnonbondedforce_setnonbondedmethod_'

...... snip .....

WHY?

HELP!!!

P.S.  Adding OPENMM diretories doesn't help, ie. export LD_LIBRARY_PATH = ........... :$LD_LIBRARY_PATH