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-rw-r--r--pkgs/development/r-modules/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index 2294103151505..a01c053f2ee68 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -325,6 +325,7 @@ let
     Cardinal = [ pkgs.which ];
     chebpol = [ pkgs.fftw.dev ];
     ChemmineOB = with pkgs; [ openbabel pkg-config ];
+    classInt = lib.optional stdenv.isDarwin [ pkgs.libiconv ];
     curl = [ pkgs.curl.dev ];
     data_table = [ pkgs.zlib.dev ] ++ lib.optional stdenv.isDarwin pkgs.llvmPackages.openmp;
     devEMF = with pkgs; [ xorg.libXft.dev ];