SDL: Documented environment setup for PS2 development

From bb7bf2843368065f57520306202a674b7058b16d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 12 Oct 2025 09:16:08 -0700
Subject: [PATCH] Documented environment setup for PS2 development

---
 docs/README-ps2.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/README-ps2.md b/docs/README-ps2.md
index dbda4459db00d..6d3e79a57186b 100644
--- a/docs/README-ps2.md
+++ b/docs/README-ps2.md
@@ -11,6 +11,9 @@ Credit to
 ## Building
 To build SDL library for the PS2, make sure you have the latest PS2Dev status and run:
 ```bash
+export PS2DEV=/usr/local/ps2dev # or wherever your ps2dev installation is
+export PS2SDK=$PS2DEV/ps2sdk
+export PATH=$PATH:$PS2DEV/bin:$PS2DEV/ee/bin:$PS2DEV/iop/bin:$PS2DEV/dvp/bin:$PS2SDK/bin
 cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=$PS2DEV/share/ps2dev.cmake
 cmake --build build
 cmake --install build