diff --git a/pkgs/development/interpreters/perl/default.nix b/pkgs/development/interpreters/perl/default.nix
index 11a7acd617c7..99860c304685 100644
--- a/pkgs/development/interpreters/perl/default.nix
+++ b/pkgs/development/interpreters/perl/default.nix
@@ -71,8 +71,8 @@ let
     preConfigure =
       ''
         configureFlags="$configureFlags -Dprefix=$out -Dman1dir=$out/share/man/man1 -Dman3dir=$out/share/man/man3"
-    '' + optionalString stdenv.isArm ''
-      configureFlagsArray=(-Dldflags="-lm -lrt")
+      '' + optionalString (stdenv.isArm || stdenv.isMips) ''
+        configureFlagsArray=(-Dldflags="-lm -lrt")
       '' + optionalString stdenv.isDarwin ''
         substituteInPlace hints/darwin.sh --replace "env MACOSX_DEPLOYMENT_TARGET=10.3" ""
       '' + optionalString (!enableThreading) ''
diff --git a/pkgs/development/libraries/libiconv/default.nix b/pkgs/development/libraries/libiconv/default.nix
index 9b62436ae080..5f1f6afcec12 100644
--- a/pkgs/development/libraries/libiconv/default.nix
+++ b/pkgs/development/libraries/libiconv/default.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   ];
 
   postPatch =
-    lib.optionalString (stdenv.cross.libc or null == "msvcrt")
+    lib.optionalString ((stdenv ? cross && stdenv.cross.libc == "msvcrt") || stdenv.cc.nativeLibc)
       ''
         sed '/^_GL_WARN_ON_USE (gets/d' -i srclib/stdio.in.h
       '';