diff --git a/.gitignore b/.gitignore
index 22a4d8f..b81556f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ gen/
 *.elf
 __pycache__/
 *.pyc
+.toolchains/
diff --git a/Makefile b/Makefile
index 31f44f9..e16893d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 PS5_HOST ?= ps5
 PS5_PORT ?= 9021
 PATCHDL_HTTP_PORT ?= 12880
+ETAHEN_SOURCE_DIR ?= ../Source Code
 
 ifdef PS5_PAYLOAD_SDK
     include $(PS5_PAYLOAD_SDK)/toolchain/prospero.mk
@@ -16,9 +17,8 @@ SRCS := src/main.c src/patchdl_assets.c src/patchdl_websrv.c
 WEB_ASSETS := web/index.html web/styles.css web/app.js
 GEN_SRCS := $(patsubst web/%,gen/web/%.c,$(WEB_ASSETS))
 
-CFLAGS := -g -O2 -Wall -Werror -Isrc -DPATCHDL_HTTP_PORT=$(PATCHDL_HTTP_PORT)
-LDADD := -lkernel_sys
-LDADD += `$(PS5_PAYLOAD_SDK)/bin/prospero-pkg-config libmicrohttpd --libs`
+CFLAGS := -g -O2 -Wall -Werror -Isrc -I"$(ETAHEN_SOURCE_DIR)/include" -DPATCHDL_HTTP_PORT=$(PATCHDL_HTTP_PORT)
+LDADD := -L"$(ETAHEN_SOURCE_DIR)/lib" -lmicrohttpd -lkernel_sys
 
 all: $(BIN)
 
diff --git a/README.md b/README.md
index 721708b..65a1a58 100644
--- a/README.md
+++ b/README.md
@@ -68,3 +68,40 @@ argv:
 ```sh
 patchdl-ps5.elf 12881
 ```
+
+## Building
+
+PatchDL builds against `ps5-payload-dev/sdk` and reuses etaHEN's checked-in
+`libmicrohttpd.a` plus header files. By default, the Makefile expects etaHEN's
+source tree next to this repository:
+
+```text
+../Source Code/include
+../Source Code/lib
+```
+
+If the SDK is unpacked into `.toolchains/ps5-payload-sdk/ps5-payload-sdk`, the
+helper script sets the required environment automatically:
+
+```sh
+scripts/build_ps5.sh clean all
+```
+
+For a system-wide SDK install, set `PS5_PAYLOAD_SDK` yourself:
+
+```sh
+export PS5_PAYLOAD_SDK=/opt/ps5-payload-sdk
+make clean all
+```
+
+Override paths and ports as needed:
+
+```sh
+make ETAHEN_SOURCE_DIR="/path/to/etaHEN/Source Code" PATCHDL_HTTP_PORT=12881
+```
+
+Deploy with an ELF loader listening on the PS5:
+
+```sh
+PS5_HOST=ps5 PS5_PORT=9021 scripts/build_ps5.sh test
+```
diff --git a/scripts/build_ps5.sh b/scripts/build_ps5.sh
new file mode 100755
index 0000000..42365ce
--- /dev/null
+++ b/scripts/build_ps5.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+set -eu
+
+ROOT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+
+if [ -z "${PS5_PAYLOAD_SDK:-}" ]; then
+  LOCAL_SDK="$ROOT_DIR/.toolchains/ps5-payload-sdk/ps5-payload-sdk"
+  if [ -d "$LOCAL_SDK" ]; then
+    PS5_PAYLOAD_SDK="$LOCAL_SDK"
+    export PS5_PAYLOAD_SDK
+  else
+    echo "PS5_PAYLOAD_SDK is unset and no local SDK exists at $LOCAL_SDK" >&2
+    exit 1
+  fi
+fi
+
+if [ -z "${LLVM_CONFIG:-}" ] && [ -x /opt/homebrew/opt/llvm@18/bin/llvm-config ]; then
+  LLVM_CONFIG=/opt/homebrew/opt/llvm@18/bin/llvm-config
+  export LLVM_CONFIG
+fi
+
+if [ -n "${LLVM_CONFIG:-}" ]; then
+  LLVM_BIN=$(dirname -- "$LLVM_CONFIG")
+  PATH="$PS5_PAYLOAD_SDK/bin:$LLVM_BIN:$PATH"
+else
+  PATH="$PS5_PAYLOAD_SDK/bin:$PATH"
+fi
+export PATH
+
+exec make -C "$ROOT_DIR" "$@"