diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index fe0ac245c3d..8c1733925c2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4054,6 +4054,10 @@ let
 
   libiconv = callPackage ../development/libraries/libiconv { };
 
+  libiconvOrNull = if gcc ? libc then null else libiconv;
+
+  libiconvOrLibc = if gcc ? libc then gcc.libc else libiconv;
+
   libid3tag = callPackage ../development/libraries/libid3tag { };
 
   libidn = callPackage ../development/libraries/libidn { };