Add musl Chez Scheme build script for static binary delivery

ober

3a054fc3d25f68c7e753f7f3cf2d1bff82f462ee

diff --git a/support/musl-chez-build-user.sh b/support/musl-chez-build-user.sh
new file mode 100755
index 0000000..8303fcd
--- /dev/null
+++ b/support/musl-chez-build-user.sh
@@ -0,0 +1,74 @@
+#!/bin/bash
+# musl-chez-build-user.sh — Build Chez Scheme with musl libc (user install)
+#
+# Uses Chez Scheme's native --static flag (v10.4.0+).
+# Installs to ~/chez-musl by default (no sudo needed).
+#
+# Usage:
+#   ./musl-chez-build-user.sh [chez-source-dir] [install-prefix]
+#
+# Examples:
+#   ./musl-chez-build-user.sh ~/mine/ChezScheme ~/chez-musl
+#   ./musl-chez-build-user.sh  # uses defaults
+set -euo pipefail
+
+CHEZ_DIR="${1:-$HOME/mine/ChezScheme}"
+INSTALL_PREFIX="${2:-$HOME/chez-musl}"
+
+# Check for musl-gcc
+if ! command -v musl-gcc &>/dev/null; then
+	echo "ERROR: musl-gcc not found. Install musl-tools package."
+	exit 1
+fi
+
+if [ ! -d "$CHEZ_DIR" ]; then
+	echo "ERROR: Chez Scheme source not found: $CHEZ_DIR"
+	echo "Clone it: git clone https://github.com/cisco/ChezScheme.git $CHEZ_DIR"
+	exit 1
+fi
+
+cd "$CHEZ_DIR"
+
+echo "==================================="
+echo "Building Chez Scheme with musl libc"
+echo "==================================="
+echo ""
+echo "Source:  $CHEZ_DIR"
+echo "Prefix:  $INSTALL_PREFIX"
+echo ""
+
+# Clean previous build
+echo "==> Cleaning..."
+make clean 2>/dev/null || true
+
+# Configure with --static and musl-gcc
+echo "==> Configuring with --static CC=musl-gcc..."
+./configure --threads --static CC=musl-gcc --installprefix="$INSTALL_PREFIX"
+
+# Build
+echo "==> Building..."
+make -j"$(nproc)"
+
+# Verify binary is truly static
+echo "==> Verifying..."
+SCHEME_BIN="$(ls ta6le/bin/ta6le/scheme 2>/dev/null || ls */bin/*/scheme 2>/dev/null | head -1)"
+if file "$SCHEME_BIN" | grep -q "statically linked"; then
+	echo "OK: Binary is statically linked"
+else
+	echo "WARNING: Binary may not be fully static"
+	file "$SCHEME_BIN"
+fi
+
+# Install (no sudo needed for user directory)
+echo "==> Installing to $INSTALL_PREFIX..."
+make install
+
+# Summary
+echo ""
+echo "==================================="
+echo "musl Chez Scheme installed to $INSTALL_PREFIX"
+echo "==================================="
+echo ""
+echo "Jerboa will auto-detect ~/chez-musl."
+echo "Or set explicitly:"
+echo "  export JERBOA_MUSL_CHEZ_PREFIX=$INSTALL_PREFIX"