diff --git a/pkgs/tools/inputmethods/skk/skk-dicts/default.nix b/pkgs/tools/inputmethods/skk/skk-dicts/default.nix
index f20e2899f185..bb974fbc8b58 100644
--- a/pkgs/tools/inputmethods/skk/skk-dicts/default.nix
+++ b/pkgs/tools/inputmethods/skk/skk-dicts/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, buildPackages, libiconv, skktools }:
+{ lib, stdenv, fetchurl, buildPackages, iconv, skktools }:
 
 let
   # kana to kanji
@@ -25,15 +25,13 @@ let
     url = "https://raw.githubusercontent.com/skk-dev/dict/8b35d07a7d2044d48b063d2774d9f9d00bb7cb48/SKK-JISYO.assoc";
     sha256 = "1smcbyv6srrhnpl7ic9nqds9nz3g2dgqngmhzkrdlwmvcpvakp1v";
   };
-
-  iconvBin = if stdenv.isDarwin then libiconv else  buildPackages.stdenv.cc.libc;
 in
 
 stdenv.mkDerivation {
   pname = "skk-dicts-unstable";
   version = "2020-03-24";
   srcs = [ small medium large edict assoc ];
-  nativeBuildInputs = [ skktools ] ++ lib.optional stdenv.isDarwin libiconv;
+  nativeBuildInputs = [ iconv skktools ];
 
   strictDeps = true;
 
@@ -51,8 +49,7 @@ stdenv.mkDerivation {
     for src in $srcs; do
       dst=$out/share/$(dictname $src)
       echo ";;; -*- coding: utf-8 -*-" > $dst  # libskk requires this on the first line
-      ${lib.getBin iconvBin}/bin/iconv \
-        -f EUC-JP -t UTF-8 $src | skkdic-expr2 >> $dst
+      iconv -f EUC-JP -t UTF-8 $src | skkdic-expr2 >> $dst
     done
 
     # combine .L .edict and .assoc for convenience
diff --git a/pkgs/tools/text/cmigemo/default.nix b/pkgs/tools/text/cmigemo/default.nix
index 1f9ef7701ba1..7b2598a9cfb2 100644
--- a/pkgs/tools/text/cmigemo/default.nix
+++ b/pkgs/tools/text/cmigemo/default.nix
@@ -1,11 +1,8 @@
 { lib, stdenv, fetchFromGitHub, buildPackages
-, libiconv, nkf, perl, which
+, iconv, nkf, perl, which
 , skk-dicts
 }:
 
-let
-  iconvBin = if stdenv.isDarwin then libiconv else  buildPackages.stdenv.cc.libc;
-in
 stdenv.mkDerivation {
   pname = "cmigemo";
   version = "1.3e";
@@ -17,7 +14,7 @@ stdenv.mkDerivation {
     sha256 = "00a6kdmxp16b8x0p04ws050y39qspd1bqlfq74bkirc55b77a2m1";
   };
 
-  nativeBuildInputs = [ libiconv nkf perl which ];
+  nativeBuildInputs = [ iconv nkf perl which ];
 
   postUnpack = ''
     cp ${skk-dicts}/share/SKK-JISYO.L source/dict/
@@ -27,10 +24,6 @@ stdenv.mkDerivation {
 
   makeFlags = [ "INSTALL=install" ];
 
-  preBuild = ''
-    makeFlagsArray+=(FILTER_UTF8="${lib.getBin iconvBin}/bin/iconv -t utf-8 -f cp932")
-  '';
-
   buildFlags = [ (if stdenv.isDarwin then "osx-all" else "gcc-all") ];
 
   installTargets = [ (if stdenv.isDarwin then "osx-install" else "gcc-install") ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c56245676b56..13473a26f2c2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -21331,6 +21331,14 @@ with pkgs;
 
   libiconvReal = callPackage ../development/libraries/libiconv { };
 
+  iconv =
+    if lib.elem stdenv.hostPlatform.libc [ "glibc" "musl" ] then
+      lib.getBin stdenv.cc.libc
+    else if stdenv.hostPlatform.isDarwin then
+      lib.getBin darwin.libiconv
+    else
+      lib.getBin libiconvReal;
+
   # On non-GNU systems we need GNU Gettext for libintl.
   libintl = if stdenv.hostPlatform.libc != "glibc" then gettext else null;