Optionally store deps.jl in a different directory

Author: jlapeyre

deps/build.jl

@@ -99,7 +99,9 @@ try # make sure deps.jl file is removed on error
         error("Python 2.7 or later is required for PyCall")
     end
 
-    writeifchanged("deps.jl", """
+    dep_path = get(ENV, "PYCALL_DEPOT", "")
+
+    writeifchanged(joinpath(dep_path, "deps.jl"), """
     const python = "$(escape_string(python))"
     const libpython = "$(escape_string(libpy_name))"
     const pyprogramname = "$(escape_string(programname))"

src/startup.jl

@@ -40,7 +40,12 @@ end
 
 if !symbols_present
     # Python not present. Use deps.jl
-    const depfile = joinpath(dirname(@__FILE__), "..", "deps", "deps.jl")
+    const depfile =
+        if haskey(ENV, "PYCALL_DEPOT")
+            joinpath(ENV["PYCALL_DEPOT"], "deps.jl")
+        else
+            joinpath(dirname(@__FILE__), "..", "deps", "deps.jl")
+        end
     isfile(depfile) || error("PyCall not properly installed. Please run Pkg.build(\"PyCall\")")
     include(depfile) # generated by Pkg.build("PyCall")
     # Only to be used at top-level - pointer will be invalid after reload