diff --git a/pkgs/development/compilers/ghc/8.10.7.nix b/pkgs/development/compilers/ghc/8.10.7.nix
index 5badd8ca7e52f..2f359fd51a27f 100644
--- a/pkgs/development/compilers/ghc/8.10.7.nix
+++ b/pkgs/development/compilers/ghc/8.10.7.nix
@@ -10,7 +10,7 @@
 , # GHC can be built with system libffi or a bundled one.
   libffi ? null
 
-, useLLVM ? !stdenv.targetPlatform.isx86
+, useLLVM ? stdenv.targetPlatform.useiOSPrebuilt || !stdenv.targetPlatform.isx86
 , # LLVM is conceptually a run-time-only depedendency, but for
   # non-x86, we need LLVM to bootstrap later stages, so it becomes a
   # build-time dependency too.
@@ -248,7 +248,10 @@ stdenv.mkDerivation (rec {
   buildInputs = [ perl bash ] ++ (libDeps hostPlatform);
 
   propagatedBuildInputs = [ targetPackages.stdenv.cc ]
-    ++ lib.optional useLLVM llvmPackages.llvm;
+  ++ lib.optionals useLLVM [
+    llvmPackages.llvm
+    llvmPackages.llvm.out
+  ];
 
   depsTargetTarget = map lib.getDev (libDeps targetPlatform);
   depsTargetTargetPropagated = map (lib.getOutput "out") (libDeps targetPlatform);
diff --git a/pkgs/development/haskell-modules/with-packages-wrapper.nix b/pkgs/development/haskell-modules/with-packages-wrapper.nix
index 8c8833ad82e83..ac6e2b13525ba 100644
--- a/pkgs/development/haskell-modules/with-packages-wrapper.nix
+++ b/pkgs/development/haskell-modules/with-packages-wrapper.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, ghc, llvmPackages, packages, symlinkJoin, makeWrapper
+{ lib, stdenv, ghc, darwin, llvmPackages, packages, symlinkJoin, makeWrapper
 , withLLVM ? !(stdenv.hostPlatform.isx86_64 || stdenv.hostPlatform.isPowerPC)
 , postBuild ? ""
 , ghcLibdir ? null # only used by ghcjs, when resolving plugins
@@ -44,6 +44,10 @@ let
   packageCfgDir = "${libDir}/package.conf.d";
   paths         = lib.filter (x: x ? isHaskellLibrary) (lib.closePropagation packages);
   hasLibraries  = lib.any (x: x.isHaskellLibrary) paths;
+
+  dyld_root_path = "${darwin.iosSdkPkgs.sdk.iPhoneOSRoot}/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot";
+  isSimulator = stdenv.targetPlatform.isiOS && stdenv.targetPlatform.isx86_64;
+
   # CLang is needed on Darwin for -fllvm to work:
   # https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/codegens.html#llvm-code-generator-fllvm
   llvm          = lib.makeBinPath
@@ -73,6 +77,9 @@ symlinkJoin {
           ${lib.optionalString (ghc.isGhcjs or false)
             ''--set NODE_PATH "${ghc.socket-io}/lib/node_modules"''
           } \
+          ${lib.optionalString (isSimulator)
+            ''--set DYLD_ROOT_PATH "${dyld_root_path}" \''
+          }
           ${lib.optionalString withLLVM ''--prefix "PATH" ":" "${llvm}"''}
       fi
     done
@@ -92,7 +99,7 @@ symlinkJoin {
     for prg in ${ghcCommand}-pkg ${ghcCommand}-pkg-${ghc.version}; do
       if [[ -x "${ghc}/bin/$prg" ]]; then
         rm -f $out/bin/$prg
-        makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
+        makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}" ${lib.optionalString (isSimulator) ''--set DYLD_ROOT_PATH "${dyld_root_path}"''}
       fi
     done
 
diff --git a/pkgs/os-specific/darwin/xcode/sdk-pkgs.nix b/pkgs/os-specific/darwin/xcode/sdk-pkgs.nix
index 6d8ed9f532260..a84914e0cd96d 100644
--- a/pkgs/os-specific/darwin/xcode/sdk-pkgs.nix
+++ b/pkgs/os-specific/darwin/xcode/sdk-pkgs.nix
@@ -22,6 +22,8 @@ rec {
     type = "derivation";
     outPath = xcode + "/Contents/Developer/Platforms/${platform}.platform/Developer/SDKs/${platform}${version}.sdk";
 
+    iPhoneOSRoot = xcode + "/Contents/Developer/Platforms/iPhoneOS.platform";
+
     platform = targetPlatform.xcodePlatform;
     version = targetPlatform.sdkVer;
   };
diff --git a/pkgs/stdenv/cross/default.nix b/pkgs/stdenv/cross/default.nix
index ef088bec75d7b..4844dc6f9ec7b 100644
--- a/pkgs/stdenv/cross/default.nix
+++ b/pkgs/stdenv/cross/default.nix
@@ -84,8 +84,13 @@ in lib.init bootStages ++ [
         ++ lib.optional (hostPlatform.config == "x86_64-w64-mingw32") buildPackages.file
         ;
 
+
+
       # temp hack to avoid ios macos clash
-      preHook = lib.concatStringsSep "\n"
+      preHook = lib.optionalString (crossSystem.useiOSPrebuilt && crossSystem.isx86_64) ''
+        export DYLD_ROOT_PATH=${buildPackages.darwin.iosSdkPkgs.sdk.iPhoneOSRoot}/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot
+        echo -e "\n!! iOS Simulator in use !!\nDYLD_ROOT_PATH: $DYLD_ROOT_PATH\n!! iOS Simulator !!\n"
+      '' + lib.concatStringsSep "\n"
         (lib.filter
           (l: ! lib.strings.hasInfix "-sdk_version" l)
           (lib.strings.splitString "\n" old.preHook));