update build script to rename version file

build.nims

@@ -2,10 +2,28 @@ mode = ScriptMode.Verbose
 
 import std/os except commandLineParams
 
+const VendorPath = "vendor/nim-nat-traversal/vendor/libnatpmp-upstream"
+let 
+  oldVersionFile = joinPath(VendorPath, "VERSION")
+  newVersionFile = joinPath(VendorPath, "VERSION_temp")
+
+proc renameFile(oldName, newName: string) =
+  if fileExists(oldName):
+    mvFile(oldName, newName)
+  else:
+    echo "File ", oldName, " does not exist"
+
+
 ### Helper functions
 proc buildBinary(name: string, srcDir = "./", params = "", lang = "c") =
+  # This is a quick workaround to avoid VERSION file conflict on macOS
+  # More details here: https://github.com/codex-storage/nim-codex/issues/1059
+  if defined(macosx):
+    renameFile(oldVersionFile, newVersionFile)
+
   if not dirExists "build":
     mkDir "build"
+
   # allow something like "nim nimbus --verbosity:0 --hints:off nimbus.nims"
   var extra_params = params
   when compiles(commandLineParams):
@@ -19,8 +37,12 @@ proc buildBinary(name: string, srcDir = "./", params = "", lang = "c") =
     # Place build output in 'build' folder, even if name includes a longer path.
     outName = os.lastPathPart(name)
     cmd = "nim " & lang & " --out:build/" & outName & " " & extra_params & " " & srcDir & name & ".nim"
+  try:
+    exec(cmd)
+  finally:
+     if defined(macosx):
+      renameFile(newVersionFile, oldVersionFile)
 
-  exec(cmd)
 
 proc test(name: string, srcDir = "tests/", params = "", lang = "c") =
   buildBinary name, srcDir, params