diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index 615ddf5e866c..3dde649a1023 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -600,6 +600,7 @@ let
     qqconf = [ pkgs.pkg-config ];
     qspray = [ pkgs.pkg-config ];
     ratioOfQsprays = [ pkgs.pkg-config ];
+    watcher = with pkgs; [ cmake which ];
     symbolicQspray = [ pkgs.pkg-config ];
     sphereTessellation = [ pkgs.pkg-config ];
     vapour = [ pkgs.pkg-config ];