diff --git a/pkgs/build-support/build-fhs-chrootenv/default.nix b/pkgs/build-support/build-fhs-chrootenv/default.nix
index 461f4762aba..dfce8edcb23 100644
--- a/pkgs/build-support/build-fhs-chrootenv/default.nix
+++ b/pkgs/build-support/build-fhs-chrootenv/default.nix
@@ -1,4 +1,4 @@
-{ stdenv } : { env } :
+{ stdenv } : { env, extraInstallCommands ? "" } :
 
 let
   # References to shell scripts that set up or tear down the environment
@@ -43,5 +43,6 @@ in stdenv.mkDerivation {
         -e "s|@name@|${name}|g" \
         ${destroySh} > destroy-${name}-chrootenv
     chmod +x destroy-${name}-chrootenv
+    ${extraInstallCommands}
   '';
 }
diff --git a/pkgs/build-support/build-fhs-userenv/default.nix b/pkgs/build-support/build-fhs-userenv/default.nix
index 424adf081ca..aa95080ac52 100644
--- a/pkgs/build-support/build-fhs-userenv/default.nix
+++ b/pkgs/build-support/build-fhs-userenv/default.nix
@@ -1,4 +1,5 @@
-{ runCommand, lib, writeText, writeScriptBin, stdenv, ruby } : { env, runScript ? "bash", extraBindMounts ? [] } :
+{ runCommand, lib, writeText, writeScriptBin, stdenv, ruby } :
+{ env, runScript ? "bash", extraBindMounts ? [], extraInstallCommands ? "" } :
 
 let
   name = env.pname;
@@ -44,4 +45,5 @@ in runCommand name {
   exec ${chroot-user}/bin/chroot-user ${env} bash -l ${init runScript} "\$(pwd)" "\$@"
   EOF
   chmod +x $out/bin/${name}
+  ${extraInstallCommands}
 ''
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1cd2e94402f..44a379a8a38 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -273,13 +273,15 @@ let
   };
 
   buildFHSChrootEnv = args: chrootFHSEnv {
-    env = buildFHSEnv args;
+    env = buildFHSEnv (removeAttrs args [ "extraInstallCommands" ]);
+    extraInstallCommands = args.extraInstallCommands or "";
   };
 
   buildFHSUserEnv = args: userFHSEnv {
-    env = buildFHSEnv (removeAttrs args [ "runScript" "extraBindMounts" ]);
+    env = buildFHSEnv (removeAttrs args [ "runScript" "extraBindMounts" "extraInstallCommands" ]);
     runScript = args.runScript or "bash";
     extraBindMounts = args.extraBindMounts or [];
+    extraInstallCommands = args.extraInstallCommands or "";
   };
 
   buildMaven = callPackage ../build-support/build-maven.nix {};