diff --git a/labgrid/config/rule.bzl b/labgrid/config/rule.bzl
index 596a00cf3a1b3c084f6451efc6ef0fb7d64359eb..97733b1ae865ebf9eca4847fcbced2f285ef5601 100644
--- a/labgrid/config/rule.bzl
+++ b/labgrid/config/rule.bzl
@@ -61,7 +61,7 @@ ATTRS = {
         cfg = "exec",
     ),
     "env": attr.string_dict(
-        doc = "The environment variables to set. Subject to `$(location)` substitution.",
+        doc = "The environment variables to set. Subject to `$(location)` and \"Make\" variable substitution.",
     ),
     "data": attr.label_list(
         allow_files = True,
@@ -82,9 +82,31 @@ def _forward(target):
 def _flatten(iterable):
     return [e for x in iterable for e in x]
 
+def _expand(ctx, data, value):
+    value = value.replace("$(location", "$(rlocationpath")
+    value = ctx.expand_location(value, targets = data)
+    for k, v in ctx.var.items():
+        value = value.replace("$({})".format(k), _runfile(v))
+    return value
+
+# FIXME: separator changes to `+` on Bazel 8+
+def _runfile(value, separator = "~"):
+    # Non-runfile value
+    if not value.startswith("bazel-out/"):
+        return value
+
+    _, found, rest = value.partition("/external/")
+    if found:
+        workspace_name, workspaced, short_path = rest.partition("{}/".format(separator))
+        if workspaced:
+            return "{}/{}".format(workspace_name, short_path)
+        fail("Failed to convert runfile `path` to `rlocationpath`: {}".format(value))
+
+    return value
+
 def implementation(ctx):
-    data = ctx.attr.data + [ctx.attr.src]
-    env = {k: ctx.expand_location(v, targets = data) for k, v in ctx.attr.env.items()}
+    data = ctx.attr.data + [ctx.attr.src] + ctx.attr.toolchains
+    env = {k: _expand(ctx, data, v) for k, v in ctx.attr.env.items()}
     default = DefaultInfo(files = depset([ctx.file.src]))
     toolchain = platform_common.ToolchainInfo(
         src = ctx.file.src,
diff --git a/labgrid/config/toolchain/macro.bzl b/labgrid/config/toolchain/macro.bzl
index 99a7af8147244f6fd718d2aeec7a60b1d9ec7373..3928a6777f09ff4e18816f1cdf0e4fa155e8c804 100644
--- a/labgrid/config/toolchain/macro.bzl
+++ b/labgrid/config/toolchain/macro.bzl
@@ -2,16 +2,18 @@ load("@rules_labgrid//labgrid/config:defs.bzl", "labgrid_config")
 
 visibility("//...")
 
-def labgrid_config_toolchain(*, name, src, state, target_compatible_with, manager = "@rules_labgrid//labgrid/manager:passthrough", deps = ()):
+def labgrid_config_toolchain(*, name, src, state, target_compatible_with, manager = "@rules_labgrid//labgrid/manager:passthrough", deps = (), env = {}, data = [], toolchains = []):
     src = native.package_relative_label(src)
     labgrid_config(
         name = "{}-config".format(name),
         src = src,
         deps = [native.package_relative_label(d) for d in deps],
-        env = {
-            "LG_ENV": "$(rlocationpath {})".format(src),
+        env = env | {
+            "LG_ENV": "$(location {})".format(src),
             "LG_STATE": state,
         },
+        data = data,
+        toolchains = toolchains,
         manager = native.package_relative_label(manager),
     )