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-rw-r--r--pkgs/development/ocaml-modules/ocaml-lsp/default.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/default.nix b/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
index 13ae64292ec..602f5eb77fe 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
@@ -1,4 +1,4 @@
-{ buildDunePackage, jsonrpc, lsp, re, makeWrapper, dot-merlin-reader }:
+{ lib, buildDunePackage, jsonrpc, lsp, re, makeWrapper, dot-merlin-reader, spawn }:
 
 buildDunePackage {
   pname = "ocaml-lsp-server";
@@ -7,7 +7,8 @@ buildDunePackage {
 
   inherit (lsp) preBuild;
 
-  buildInputs = lsp.buildInputs ++ [ lsp re ];
+  buildInputs = lsp.buildInputs ++ [ lsp re ]
+  ++ lib.optional (lib.versionAtLeast jsonrpc.version "1.9") spawn;
 
   nativeBuildInputs = [ makeWrapper ];