diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index 3de5d13e9c92..aa7d65320671 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -498,7 +498,9 @@ let
 
   packagesWithBuildInputs = {
     # sort -t '=' -k 2
+    deldir = lib.optionals stdenv.isDarwin [ pkgs.libiconv ];
     gam = lib.optionals stdenv.isDarwin [ pkgs.libiconv ];
+    interp = lib.optionals stdenv.isDarwin [ pkgs.libiconv ];
     RcppArmadillo = lib.optionals stdenv.isDarwin [ pkgs.libiconv ];
     quantreg = lib.optionals stdenv.isDarwin [ pkgs.libiconv ];
     rmutil = lib.optionals stdenv.isDarwin [ pkgs.libiconv ];