From a5b8f0ed1004d4d88b765867fede1fdf72150fdc Mon Sep 17 00:00:00 2001
From: Malcolm Fell <malcolm@fell.nz>
Date: Tue, 28 Jul 2026 10:37:28 +1200
Subject: [PATCH] install/build: require macOS 26 with a clear early error

install.sh checked Darwin + arm64 but not the OS version. maic needs
FoundationModels (macOS 26+), so on older macOS the install succeeded
and the binary then failed to launch with a cryptic dyld version error.

Add a sw_vers guard to both install.sh and build.sh so they fail fast
with 'requires macOS 26 or later (detected <ver>)' instead.

Closes #8
---
 build.sh   | 5 +++++
 install.sh | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/build.sh b/build.sh
index a8e776a..5e05703 100755
--- a/build.sh
+++ b/build.sh
@@ -6,6 +6,11 @@ cd "$(dirname "$0")"
 
 PREFIX="${PREFIX:-$HOME/.local/bin}"
 
+# maic needs FoundationModels, which only exists on macOS 26+. Fail early with a
+# clear message rather than letting `swift build` emit an opaque SDK error.
+os_ver="$(sw_vers -productVersion)"
+[ "${os_ver%%.*}" -ge 26 ] 2>/dev/null || { echo "build: maic requires macOS 26 or later (detected $os_ver)." >&2; exit 1; }
+
 echo "Building (release)…"
 swift build -c release
 
diff --git a/install.sh b/install.sh
index 83c9e7e..49048f6 100755
--- a/install.sh
+++ b/install.sh
@@ -28,6 +28,12 @@ esac
 arch="$(uname -m)"
 [ "$arch" = "arm64" ] || err "maic ships arm64-only (Apple silicon); detected '$arch'."
 
+# maic needs FoundationModels, which only exists on macOS 26+. Without this the
+# install succeeds but the binary can't launch (a cryptic dyld version error) —
+# so fail here with a clear message instead.
+os_ver="$(sw_vers -productVersion)"
+[ "${os_ver%%.*}" -ge 26 ] 2>/dev/null || err "maic requires macOS 26 or later (detected $os_ver)."
+
 for tool in curl tar shasum; do
   command -v "$tool" >/dev/null 2>&1 || err "required tool not found: $tool"
 done