Update

src/Xpress.jl

@@ -12,7 +12,15 @@ import SparseArrays
 # Load in `deps.jl`, complaining if it does not exist
 const depsjl_path = joinpath(@__DIR__, "..", "deps", "deps.jl")
 
-libxprs = ""
+if isfile(depsjl_path)
+    include(depsjl_path)
+    global libxprs = joinpath(
+        xpressdlpath,
+        string(Sys.iswindows() ? "" : "lib", "xprs", ".", Libdl.dlext),
+    )
+else
+    global libxprs = ""
+end
 
 include("Lib/Lib.jl")
 
@@ -36,27 +44,24 @@ const XPRS_ATTRIBUTES = Dict{String,Any}(
 )
 
 function initialize()
+    Libdl.dlopen(libxprs)
     userlic()
-    init() # Call XPRSinit for initialization
+    init()
+    # Calling free is not necessary since destroyprob is called
+    # in the finalizer.
     return
 end
 
 include("MOI/MOI_wrapper.jl")
 include("MOI/MOI_callbacks.jl")
 
 function __init__()
-    if isfile(depsjl_path)
-        include(depsjl_path)
-        global libxprs = joinpath(
-            xpressdlpath,
-            string(Sys.iswindows() ? "" : "lib", "xprs", ".", Libdl.dlext),
-        )
-    elseif haskey(ENV, "XPRESS_JL_LIBRARY")
+    if haskey(ENV, "XPRESS_JL_LIBRARY")
         global libxprs = ENV["XPRESS_JL_LIBRARY"]
-    elseif !haskey(ENV, "XPRESS_JL_NO_DEPS_ERROR")
+        Lib._set_libxprs(libxprs)
+    elseif isempty(libxprs) && !haskey(ENV, "XPRESS_JL_NO_DEPS_ERROR")
         error("XPRESS cannot be loaded. Please run Pkg.build(\"Xpress\").")
     end
-    Lib._set_libxprs(libxprs)
     if !haskey(ENV, "XPRESS_JL_NO_AUTO_INIT") &&
        get(ENV, "JULIA_REGISTRYCI_AUTOMERGE", "false") != "true"
         initialize()