diff --git a/Makefile b/Makefile
index 82cc1d8e..5e4d6be2 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ cljfmt:
 	lein with-profile +$(VERSION),+cljfmt cljfmt check
 
 kondo:
-	lein with-profile -dev,+clj-kondo run -m clj-kondo.main --lint src test
+	lein with-profile -dev,+clj-kondo run -m clj-kondo.main --lint src test src-jdk8 src-newer-jdks
 
 # When releasing, the BUMP variable controls which field in the
 # version string will be incremented in the *next* snapshot
diff --git a/dev/user.clj b/dev/user.clj
new file mode 100644
index 00000000..4306148c
--- /dev/null
+++ b/dev/user.clj
@@ -0,0 +1,18 @@
+(ns user
+  (:require
+   [clojure.java.javadoc :refer [javadoc]]
+   [clojure.pprint :refer [pprint]]
+   [clojure.reflect :refer [reflect]]
+   [clojure.repl :refer [apropos dir doc find-doc pst source]]
+   [clojure.set :as set]
+   [clojure.string :as string]
+   [clojure.test :as test]
+   [clojure.tools.namespace.repl :refer [refresh refresh-all clear refresh-dirs set-refresh-dirs]]))
+
+(def jdk8?
+  (->> "java.version" System/getProperty (re-find #"^1.8.")))
+
+(cond->> ["dev" "src" "test"]
+  jdk8?       (into ["src-jdk8"])
+  (not jdk8?) (into ["src-newer-jdks"])
+  true        (apply set-refresh-dirs))
diff --git a/project.clj b/project.clj
index 4e82d914..85866978 100644
--- a/project.clj
+++ b/project.clj
@@ -86,6 +86,8 @@
   :jvm-opts ["-Dorchard.use-dynapath=true"
              "-Dclojure.main.report=stderr"]
 
+  :source-paths ["src" "src-jdk8" "src-newer-jdks"]
+
   :profiles {
              ;; Clojure versions matrix
              :provided {:dependencies [[org.clojure/clojure "1.10.1"]
@@ -116,7 +118,9 @@
                                        [])}
 
              ;; Development tools
-             :dev {:dependencies [[pjstadig/humane-test-output "0.10.0"]]
+             :dev {:dependencies [[org.clojure/tools.namespace "1.1.0"]
+                                  [pjstadig/humane-test-output "0.10.0"]]
+                   :source-paths ["dev"]
                    :resource-paths ["test-resources"]
                    :plugins [[com.jakemccrary/lein-test-refresh "0.23.0"]]
                    :injections [(require 'pjstadig.humane-test-output)
diff --git a/src/orchard/java/legacy_parser.clj b/src-jdk8/orchard/java/legacy_parser.clj
similarity index 100%
rename from src/orchard/java/legacy_parser.clj
rename to src-jdk8/orchard/java/legacy_parser.clj
diff --git a/src/orchard/java/parser.clj b/src-newer-jdks/orchard/java/parser.clj
similarity index 100%
rename from src/orchard/java/parser.clj
rename to src-newer-jdks/orchard/java/parser.clj