Building CPLEX fails in Julia - julia

Question

I am trying to install CPLEX in Julia on a computer cluster. I got the following error when I did Pkg.build("CPLEX"). It seems that I didn't pass the right path. I know how to correct it on my local computer but could anyone tell me how to fix it on a computer cluster? Or is it because of some other problems?
For your information,
CPLEX version: 12.10-GCCcore-8.3.0,
Julia version: 1.7.1.
Thanks very much in advance.
Hongyu.
The versions of CPLEX supported by CPLEX.jl are:
* 12.10
* 20.1
You must download and install one of these versions separately.
You should set the `CPLEX_STUDIO_BINARIES` environment variable to point to
the install location then try again. For example (updating the path to the
correct location):
ENV["CPLEX_STUDIO_BINARIES"] = "/opt/CPLEX_Studio201/cplex/bin/x86-64_linux/"
import Pkg
Pkg.add("CPLEX")
Pkg.build("CPLEX")
See the CPLEX.jl README at https://github.com/jump-dev/CPLEX.jl for further
instructions.
Stacktrace:
[1] error(s::String)
# Base ./error.jl:33
[2] try_local_installation()
# Main ~/.julia/packages/CPLEX/88lum/deps/build.jl:132
[3] top-level scope
# ~/.julia/packages/CPLEX/88lum/deps/build.jl:150
[4] include(fname::String)
# Base.MainInclude ./client.jl:451
[5] top-level scope
# none:5
in expression starting at /home/hongyuzh/.julia/packages/CPLEX/88lum/deps/build.jl:143
Stacktrace:
[1] pkgerror(msg::String)
# Pkg.Types /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Types.jl:68
[2] (::Pkg.Operations.var"#62#67"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec})()
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:962
[3] withenv(::Pkg.Operations.var"#62#67"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, ::Pair{String, String}, ::Vararg{Pair{String}})
# Base ./env.jl:172
[4] (::Pkg.Operations.var"#99#103"{String, Bool, Bool, Bool, Pkg.Operations.var"#62#67"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec})()
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1506
[5] with_temp_env(fn::Pkg.Operations.var"#99#103"{String, Bool, Bool, Bool, Pkg.Operations.var"#62#67"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec}, temp_env::String)
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1390
[6] (::Pkg.Operations.var"#98#102"{Bool, Bool, Bool, Pkg.Operations.var"#62#67"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String})(tmp::String)
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1469
[7] mktempdir(fn::Pkg.Operations.var"#98#102"{Bool, Bool, Bool, Pkg.Operations.var"#62#67"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String}, parent::String; prefix::String)
# Base.Filesystem ./file.jl:750
[8] mktempdir(fn::Function, parent::String) (repeats 2 times)
# Base.Filesystem ./file.jl:748
[9] sandbox(fn::Function, ctx::Pkg.Types.Context, target::Pkg.Types.PackageSpec, target_path::String, sandbox_path::String, sandbox_project_override::Pkg.Types.Project; force_latest_compatible_version::Bool, allow_earlier_backwards_compatible_versions::Bool, allow_reresolve::Bool)
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1435
[10] sandbox(fn::Function, ctx::Pkg.Types.Context, target::Pkg.Types.PackageSpec, target_path::String, sandbox_path::String, sandbox_project_override::Pkg.Types.Project)
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1432
[11] build_versions(ctx::Pkg.Types.Context, uuids::Set{Base.UUID}; verbose::Bool)
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:943
[12] build(ctx::Pkg.Types.Context, uuids::Set{Base.UUID}, verbose::Bool)
# Pkg.Operations /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:822
[13] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; verbose::Bool, kwargs::Base.Pairs{Symbol, Base.TTY, Tuple{Symbol}, NamedTuple{(:io,), Tuple{Base.TTY}}})
# Pkg.API /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:992
[14] build(pkgs::Vector{Pkg.Types.PackageSpec}; io::Base.TTY, kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
# Pkg.API /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:149
[15] build(pkgs::Vector{Pkg.Types.PackageSpec})
# Pkg.API /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:144
[16] #build#99
# /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:142 [inlined]
[17] build
# /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:142 [inlined]
[18] #build#98
# /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:141 [inlined]
[19] build(pkg::String)
# Pkg.API /share/apps/Julia/1.7.1-linux-x86_64/share/julia/stdlib/v1.7/Pkg/src/API.jl:141
[20] top-level scope
# REPL[138]:1

Answer 1

(Solution found in comment discussion, adding as answer for better visibility.)
As the error message indicates, you have to set the ENV["CPLEX_STUDIO_BINARIES"] value to the directory that contains cplex. You can find that by running which cplex | xargs dirname (or simply which cplex and removing the final cplex from the result yourself).
One you set CPLEX_STUDIO_BINARIES to that path, you can run Pkg.build("CPLEX") again to let CPLEX.jl pick up the binaries from the path.