add note about FreeBSD

README.md

@@ -1,15 +1,32 @@
-# Busybox HTTPD SH Server
-
-A simple HTML templating SH solution that runs with just `httpd` and `sh` from `busybox`.
-
-*(Note: Alpine Linux now splits Busybox into multiple packages: `apk add busybox-extras`)*
-
-## Quickstart
-
-Run the command:
-
-```sh
-busybox httpd -vv -fp 8080
-```
-
-And then open `http://localhost:8080` in your browser.
+# Busybox HTTPD SH Server
+
+A simple HTML templating SH solution that runs with just `httpd` and `sh` from `busybox`.
+
+*(Note: Alpine Linux now splits Busybox into multiple packages: `apk add busybox-extras`)*
+
+## Quickstart
+
+Run the command:
+
+```sh
+busybox httpd -vv -fp 8080
+```
+
+And then open `http://localhost:8080` in your browser.
+
+### FreeBSD
+
+The demo syntax used in the interpreter script is not compatible with FreeBSD's `sh`.
+The following patch makes it use the default Busybox `ash` applet installed via `pkg install busybox`:
+
+```diff
+diff --git a/interpreter.server_core_internal b/interpreter.server_core_internal
+index 097f55f..604fe7f 100755
+--- a/interpreter.server_core_internal
++++ b/interpreter.server_core_internal
+@@ -1,4 +1,4 @@
+-#!/bin/sh
++#!/usr/local/bin/busybox ash
+
+ server_core_internal_file="${1:-index.html}"
+```