GMT cannot plot on CentOS 7

[melodyjulia]

Please try this code with Julia v1.12.4 and GMT.jl v1.35.0:

coast(region=:global, proj=:Winkel, frame=:g, land=:burlywood4, show=true)

psconvert [ERROR]: Cannot execute Ghostscript ('/home/test/.julia/artifacts/2039c07ff05f00d681aa777c71d90947251e16fa/bin/gs').
ERROR: Something went wrong when calling the module. GMT error number = 79
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:44
  [2] gmt(::String)
    @ GMT ~/.julia/packages/GMT/hBo3v/src/gmt_main.jl:166
  [3] showfig(d::Dict{Symbol, Any}, fname_ps::String, fname_ext::String, opt_T::String, K::Bool, fname::String)
    @ GMT ~/.julia/packages/GMT/hBo3v/src/common_options.jl:4204
  [4] finish_PS_module_barr_last(d::Dict{…}, cmd::Vector{…}, fname::String, fname_ext::String, opt_extra::String, output::String, opt_T::String, K::Bool, P::Nothing)
    @ GMT ~/.julia/packages/GMT/hBo3v/src/common_options.jl:4586
  [5] finish_PS_module(d::Dict{Symbol, Any}, cmd::Vector{String}, opt_extra::String, K::Bool, O::Bool, finish::Bool, args::Nothing)
    @ GMT ~/.julia/packages/GMT/hBo3v/src/common_options.jl:4524
  [6] prep_and_call_finish_PS_module
    @ ~/.julia/packages/GMT/hBo3v/src/common_options.jl:4428 [inlined]
  [7] prep_and_call_finish_PS_module
    @ ~/.julia/packages/GMT/hBo3v/src/common_options.jl:4427 [inlined]
  [8] coast(cmd0::String; clip::String, first::Bool, kwargs::@Kwargs{region::Symbol, proj::Symbol, frame::Symbol, land::Symbol, show::Bool})
    @ GMT ~/.julia/packages/GMT/hBo3v/src/pscoast.jl:85
  [9] coast
    @ ~/.julia/packages/GMT/hBo3v/src/pscoast.jl:78 [inlined]
 [10] top-level scope
    @ REPL[2]:1

[melodyjulia]

I tried the gs command directly:

/home/test/.julia/artifacts/2039c07ff05f00d681aa777c71d90947251e16fa/bin/gs

/lib64/libz.so.1: version `ZLIB_1.2.9' not found

It seems gs increased the zlib requirement.

[joa-quim]

Hmm, can't reproduce it neither in WSL nor in Linux Codespaces. And it looks that it's searching for a system libz but the artifact jl file says Add the path for our own zlib

and also
Dependency("Zlib_jll"; compat="1.2.12")

and I run the CI's yesterday and the Linux runs passed
https://github.com/GenericMappingTools/GMT.jl/actions/runs/21320536402/job/61369715490

[melodyjulia]

Could WSL or Linux Codespaces ship a newer zlib?

[joa-quim]

Don't know but from the comments in the Ghostscript/build_tarballs.jl I would say that it's a job for the Ghostscript_jll. Try installing it explicitly.

[joa-quim]

When did that start to happen?

[melodyjulia]

Thanks for your suggestions. Installing Ghostscript_jll v9.55.0+4 solves the problem. Errors occur for v9.55.1+0.

[joa-quim]

Good. And could you please report that to Ghostscript_jll authors?

Maybe here https://github.com/JuliaPackaging/Yggdrasil/issues

[melodyjulia]

Sure. Please refer to JuliaPackaging/Yggdrasil#13018

[melodyjulia]

I rechecked the problem. When using Ghostscript_jll v9.55.1+0, only GMTjl_test.ps is generated, but not the GMTjl_test.png file. The generated GMTjl_test.ps is correct.

[joa-quim]

Sure. The PS generation (by the C lib) is a completely separated issue from its rasterization into image formats. That is the part where Ghostscript is used.

[joa-quim]

See JuliaPackaging/Yggdrasil#13711