Building fails with: SystemError: opening file "/Applications/Julia-1.6.app/Contents/Resources/julia/bin/../share/julia/base/sysimg.jl": Permission denied

[NightMachinery]

julia> using Pkg ; Pkg.add("MKL"); Pkg.build("MKL")
    Updating registry at `~/.julia/registries/General`
    Updating git-repo `https://github.com/JuliaRegistries/General.git`
   Resolving package versions...
  No Changes to `~/.julia/environments/v1.6/Project.toml`
  No Changes to `~/.julia/environments/v1.6/Manifest.toml`
    Building MKL → `~/.julia/scratchspaces/44cfe95a-1eb2-52ea-b672-e2afdf69b78f/b3f01117f62 MKL → `~/.julia/scratchspaces/44cfe95a-1eb2-52ea-b672-e2afdf69b78f/b3f01117f6276bbaf8a45391ceda4d78fb6eeaa0/build.log`
ERROR: Error building `MKL`: 
[ Info: Splicing in code to load MKL in /Applications/Julia-1.6.app/Contents/Resources/julia/bin/../share/julia/base/sysimg.jl
ERROR: LoadError: SystemError: opening file "/Applications/Julia-1.6.app/Contents/Resources/julia/bin/../share/julia/base/sysimg.jl": Permission denied
Stacktrace:
  [1] systemerror(p::String, errno::Int32; extrainfo::Nothing)
    @ Base ./error.jl:168
  [2] #systemerror#62
    @ ./error.jl:167 [inlined]
  [3] systemerror
    @ ./error.jl:167 [inlined]
  [4] open(fname::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Bool, append::Nothing)
    @ Base ./iostream.jl:293
  [5] open(fname::String, mode::String; lock::Bool)
    @ Base ./iostream.jl:355
  [6] open(fname::String, mode::String)
    @ Base ./iostream.jl:355
  [7] open(::Base.var"#322#323"{String, Tuple{}}, ::String, ::Vararg{String, N} where N; kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Base ./io.jl:328
  [8] open
    @ ./io.jl:328 [inlined]
  [9] write
    @ ./io.jl:420 [inlined]
 [10] insert_MKL_load(base_dir::String)
    @ Main ~/.julia/packages/MKL/HNCoo/src/install.jl:73
 [11] change_blas_library(libblas::String)
    @ Main ~/.julia/packages/MKL/HNCoo/src/install.jl:120
 [12] enable_mkl_startup()
    @ Main ~/.julia/packages/MKL/HNCoo/src/install.jl:107
 [13] top-level scope
    @ ~/.julia/packages/MKL/HNCoo/deps/build.jl:15
 [14] include(fname::String)
    @ Base.MainInclude ./client.jl:444
 [15] top-level scope
    @ none:5
in expression starting at /Users/evar/.julia/packages/MKL/HNCoo/deps/build.jl:15
Stacktrace:
  [1] pkgerror(msg::String)
    @ Pkg.Types /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Types.jl:55
  [2] (::Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec})()
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1040
  [3] withenv(::Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, ::Pair{String, String}, ::Vararg{Pair{String, B} where B, N} where N)
    @ Base ./env.jl:161
  [4] (::Pkg.Operations.var"#108#112"{String, Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec})()
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1540
  [5] with_temp_env(fn::Pkg.Operations.var"#108#112"{String, Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec}, temp_env::String)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1442
  [6] (::Pkg.Operations.var"#107#111"{Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String})(tmp::String)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1515
  [7] mktempdir(fn::Pkg.Operations.var"#107#111"{Pkg.Operations.var"#81#86"{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:729
  [8] mktempdir(fn::Function, parent::String) (repeats 2 times)
    @ Base.Filesystem ./file.jl:727
  [9] 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 /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1481
 [10] build_versions(ctx::Pkg.Types.Context, uuids::Vector{Base.UUID}; verbose::Bool)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1021
 [11] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}, verbose::Bool)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:902
 [12] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; verbose::Bool, kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Pkg.API /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:893
 [13] build
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:877 [inlined]
 [14] #build#70
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:73 [inlined]
 [15] build
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:72 [inlined]
 [16] #build#69
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:70 [inlined]
 [17] build
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:70 [inlined]
 [18] build(pkg::String; kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Pkg.API /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:69
 [19] build(pkg::String)
    @ Pkg.API /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:69
 [20] top-level scope
    @ REPL[1]:1

[ViralBShah]

MacOS doesn't like you overwriting files in installed applications. I would recommend moving to 1.7 if you want to use MKL.jl.

[NightMachinery]

MacOS doesn't like you overwriting files in installed applications. I would recommend moving to 1.7 if you want to use MKL.jl.

How does 1.7 solve this?

Can the macOS “protection” be bypassed?

[ViralBShah]

See the libblastrampoline project. There's a JuliaCon talk on it too.