3 files changed, 13 insertions, 8 deletions
diff --git a/pkgs/tools/filesystems/netatalk/default.nix b/pkgs/tools/filesystems/netatalk/default.nix
index 850e16812488..61afe6ffb90c 100644
--- a/pkgs/tools/filesystems/netatalk/default.nix
+++ b/pkgs/tools/filesystems/netatalk/default.nix
@@ -1,4 +1,4 @@
-{ fetchurl, stdenv, pkgconfig, db, libgcrypt, avahi, libiconv, pam, openssl }:
+{ fetchurl, stdenv, pkgconfig, db, libgcrypt, avahi, libiconvOrEmpty, pam, openssl }:
 
 stdenv.mkDerivation rec {
   name = "netatalk-3.1.0";
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "1d8dc8ysslkis4yl1xab1w9p0pz7a1kg0i6fds4wxsp4fhb6wqhq";
   };
 
-  buildInputs = [ pkgconfig db libgcrypt avahi libiconv pam openssl ];
+  buildInputs = [ pkgconfig db libgcrypt avahi pam openssl ] ++ libiconvOrEmpty;
 
   configureFlags = [
     "--with-bdb=${db}"
diff --git a/pkgs/tools/misc/mdbtools/git.nix b/pkgs/tools/misc/mdbtools/git.nix
index b97af331093b..11b5520c7bb2 100644
--- a/pkgs/tools/misc/mdbtools/git.nix
+++ b/pkgs/tools/misc/mdbtools/git.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, fetchgit, glib, readline, bison, flex, pkgconfig,
-  libiconv, autoconf, automake, libtool, which, txt2man, gnome_doc_utils,
+  libiconvOrEmpty, autoconf, automake, libtool, which, txt2man, gnome_doc_utils,
   scrollkeeper}:
 
 stdenv.mkDerivation {
@@ -12,8 +12,10 @@ stdenv.mkDerivation {
     name = "mdbtools-git-export";
   };
 
-  buildInputs = [glib readline bison flex pkgconfig libiconv autoconf automake
-    libtool which txt2man gnome_doc_utils scrollkeeper ];
+  buildInputs = [
+    glib readline bison flex pkgconfig autoconf automake
+    libtool which txt2man gnome_doc_utils scrollkeeper
+  ] ++ libiconvOrEmpty;
 
   preConfigure = ''
     sed -e 's@static \(GHashTable [*]mdb_backends;\)@\1@' -i src/libmdb/backend.c
diff --git a/pkgs/tools/security/clamav/default.nix b/pkgs/tools/security/clamav/default.nix
index 7dc13b3d11b2..6cbc82b26953 100644
--- a/pkgs/tools/security/clamav/default.nix
+++ b/pkgs/tools/security/clamav/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, zlib, bzip2, libiconv, libxml2, openssl, ncurses, curl }:
+{ stdenv, fetchurl, zlib, bzip2, libiconvOrNull, libxml2, openssl, ncurses, curl }:
 stdenv.mkDerivation rec {
   name = "clamav-${version}";
   version = "0.98.4";
@@ -8,12 +8,15 @@ stdenv.mkDerivation rec {
     sha256 = "071yzamalj3rf7kl2jvc35ipnk1imdkq5ylbb8whyxfgmd3nf06k";
   };
 
-  buildInputs = [ zlib bzip2 libiconv libxml2 openssl ncurses curl ];
+  buildInputs = [ zlib bzip2 libxml2 openssl ncurses curl ]
+    ++ stdenv.lib.optional (libiconvOrNull != null) libiconvOrNull;
 
   configureFlags = [
     "--with-zlib=${zlib}"
     "--with-libbz2-prefix=${bzip2}"
-    "--with-iconv-dir=${libiconv}"
+  ] ++ (stdenv.lib.optional (libiconvOrNull != null)
+       "--with-iconv-dir=${libiconvOrNull}")
+  ++ [
     "--with-xml=${libxml2}"
     "--with-openssl=${openssl}"
     "--with-libncurses-prefix=${ncurses}"