diff --git a/flake.nix b/flake.nix
index 6a78552..07877c6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,8 +10,11 @@
       devShells = forAllSystems (system:
         let
           pkgs = nixpkgs.legacyPackages.${system};
-          harec = pkgs.callPackage ./pkgs/harec.nix { };
-          hare = pkgs.callPackage ./pkgs/hare.nix { inherit harec; };
+          hareAs = pkgs.callPackage ./pkgs/hare-as.nix { };
+          hareCc = pkgs.callPackage ./pkgs/hare-cc.nix { };
+          hareLd = pkgs.callPackage ./pkgs/hare-ld.nix { };
+          harec = pkgs.callPackage ./pkgs/harec.nix { inherit hareAs hareCc hareLd; };
+          hare = pkgs.callPackage ./pkgs/hare.nix { inherit harec hareAs hareCc hareLd; };
         in
         {
           default = pkgs.mkShell {
diff --git a/pkgs/hare-as.nix b/pkgs/hare-as.nix
new file mode 100644
index 0000000..e147d55
--- /dev/null
+++ b/pkgs/hare-as.nix
@@ -0,0 +1,11 @@
+{
+  stdenv,
+  python3,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "hare-as";
+  version = "1.0";
+  unpackPhase = ":";
+  buildInputs = [ python3 ];
+  installPhase = "install -m755 -D ${./hare-as.py} $out/bin/hare-as";
+})
diff --git a/pkgs/hare-as.py b/pkgs/hare-as.py
index b1b0411..3918f49 100755
--- a/pkgs/hare-as.py
+++ b/pkgs/hare-as.py
@@ -1,8 +1,8 @@
-#!/usr/bin/env python3
+#!python3
 
 import re
 import sys
-from subprocess import Popen, PIPE, STDOUT
+from subprocess import Popen, PIPE
 
 def header(filename):
     return f"""
diff --git a/pkgs/hare-cc.nix b/pkgs/hare-cc.nix
new file mode 100644
index 0000000..8de0473
--- /dev/null
+++ b/pkgs/hare-cc.nix
@@ -0,0 +1,19 @@
+{
+  stdenv,
+  rustc,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "hare-cc";
+  version = "1.0";
+  buildInputs = [ rustc ];
+  unpackPhase = ":";
+  buildPhase = ''
+      sed \
+        -e 's/"ld"/"cc"/g' \
+        -e 's/let mut args/let mut _args/' \
+        -e '11 a let mut args = vec![];' \
+        ${./ld.rs} > ld.rs
+      rustc -o hare-cc.bin ld.rs
+  '';
+  installPhase = "install -m755 -D hare-cc.bin $out/bin/hare-cc";
+})
diff --git a/pkgs/hare-ld.nix b/pkgs/hare-ld.nix
new file mode 100644
index 0000000..9ce5ae4
--- /dev/null
+++ b/pkgs/hare-ld.nix
@@ -0,0 +1,15 @@
+{
+  stdenv,
+  rustc,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "hare-ld";
+  version = "1.0";
+  buildInputs = [ rustc ];
+  unpackPhase = ":";
+  buildPhase = ''
+      cp ${./ld.rs} ld.rs
+      rustc -o hare-ld.bin ld.rs
+  '';
+  installPhase = "install -m755 -D hare-ld.bin $out/bin/hare-ld";
+})
diff --git a/pkgs/hare.nix b/pkgs/hare.nix
index 3d4dad7..06896d6 100644
--- a/pkgs/hare.nix
+++ b/pkgs/hare.nix
@@ -5,10 +5,11 @@
   scdoc,
   qbe,
   harec,
-  binutils-unwrapped,
   tzdata,
   python3,
-  rustc,
+  hareAs,
+  hareCc,
+  hareLd,
 }:
 let
   arch = stdenv.hostPlatform.uname.processor;
@@ -16,47 +17,6 @@ let
     x86_64 = "amd64_apple";
     aarch64 = "arm64_apple";
   }.${arch};
-  hareAs = ./hare-as.py;
-  hareLd = stdenv.mkDerivation (finalAttrs: {
-    pname = "hare-ld";
-    version = "1.0";
-    src = [ ./ld.rs ];
-    buildInputs = [ rustc ];
-    unpackPhase = ''
-      for srcFile in $src; do
-        cp $srcFile $(stripHash $srcFile)
-      done
-    '';
-    buildPhase = ''
-      rustc -o hare-ld.bin ld.rs
-    '';
-    installPhase = ''
-      mkdir -p $out/bin
-      cp hare-ld.bin $out/bin/hare-ld
-    '';
-  });
-  hareCc = stdenv.mkDerivation (finalAttrs: {
-    pname = "hare-cc";
-    version = "1.0";
-    src = [ ./ld.rs ];
-    buildInputs = [ rustc ];
-    unpackPhase = ''
-      for srcFile in $src; do
-        cp $srcFile $(stripHash $srcFile)
-      done
-    '';
-    buildPhase = ''
-      sed -i \
-        -e 's/"ld"/"cc"/g' \
-        -e '11 a let mut args = vec![];' \
-        ld.rs
-      rustc -o hare-cc.bin ld.rs
-    '';
-    installPhase = ''
-      mkdir -p $out/bin
-      cp hare-cc.bin $out/bin/hare-cc
-    '';
-  });
 in
 stdenv.mkDerivation  (finalAttrs: {
   pname = "hare";
@@ -66,9 +26,7 @@ stdenv.mkDerivation  (finalAttrs: {
     ref = "master";
     rev = "30d097a7c7f3ccf9e4fc783d1cdae1fd506673c7";
   };
-
-  patches = [
-  ];
+  doCheck = true;
 
   nativeBuildInputs = [
     harec
@@ -79,7 +37,6 @@ stdenv.mkDerivation  (finalAttrs: {
   ];
 
   buildInputs = [
-    binutils-unwrapped
     harec
     qbe
     tzdata
@@ -92,7 +49,7 @@ stdenv.mkDerivation  (finalAttrs: {
     "VERSION=${finalAttrs.version}-nixpkgs"
     "QBEFLAGS=-t${qbePlatform}"
     "CC=${hareCc}/bin/hare-cc"
-    "AS=${hareAs}"
+    "AS=${hareAs}/bin/hare-as"
     "LD=${hareLd}/bin/hare-ld"
     # Strip the variable of an empty $(SRCDIR)/hare/third-party, since nix does
     # not follow the FHS.
@@ -110,8 +67,11 @@ stdenv.mkDerivation  (finalAttrs: {
     wrapProgram $out/bin/hare \
       --prefix PATH : ${lib.makeBinPath [harec qbe]} \
       --set CC ${hareCc}/bin/hare-cc \
-      --set AS ${hareAs} \
+      --set AS ${hareAs}/bin/hare-as \
       --set LD ${hareLd}/bin/hare-ld
+
+    wrapProgram $out/bin/haredoc \
+      --prefix PATH : ${lib.makeBinPath [scdoc]}
   '';
 
   setupHook = ./setup-hook.sh;
diff --git a/pkgs/harec.nix b/pkgs/harec.nix
index 2b926cb..27ea2ff 100644
--- a/pkgs/harec.nix
+++ b/pkgs/harec.nix
@@ -1,6 +1,5 @@
-{ lib, stdenv, qbe }:
+{ stdenv, qbe, hareAs, hareCc, hareLd }:
 let
-  platform = lib.toLower stdenv.hostPlatform.uname.system;
   arch = stdenv.hostPlatform.uname.processor;
   qbePlatform = {
     x86_64 = "amd64_apple";
@@ -17,15 +16,16 @@ stdenv.mkDerivation  (finalAttrs: {
   };
   buildInputs = [ qbe ];
   nativeBuildInputs = [ qbe ];
+  doCheck = true;
 
   makeFlags = [
     "PREFIX=${builtins.placeholder "out"}"
     "ARCH=${arch}"
     "VERSION=${finalAttrs.version}-nixpkgs"
     "QBEFLAGS=-t${qbePlatform}"
-    "CC=${stdenv.cc.targetPrefix}cc"
-    "AS=${stdenv.cc.targetPrefix}as"
-    "LD=${stdenv.cc.targetPrefix}ld"
+    "CC=${hareCc}/bin/hare-cc"
+    "AS=${hareAs}/bin/hare-as"
+    "LD=${hareLd}/bin/hare-ld"
   ];
 
   postConfigure = ''