Add build/install scripts

scripts/build.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+SSLTYPE="${SSLTYPE:-unix.nopwd}"   # recommended
+TARGET="${TARGET:-lnp}"            # lnp is what you used successfully
+JOBS="${JOBS:-$(getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1)}"
+
+usage() {
+  cat <<USAGE
+Usage: $0
+
+Environment:
+  SSLTYPE   (default: unix.nopwd)
+  TARGET    (default: lnp)
+  JOBS      (default: detected CPU count)
+
+Example:
+  SSLTYPE=unix.nopwd JOBS=8 $0
+USAGE
+}
+
+if [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then
+  usage
+  exit 0
+fi
+
+cd "$ROOT"
+
+# Make sure patches are applied before building (but don't force it here).
+if [[ -d patches ]]; then
+  echo "Hint: run ./scripts/apply-patches.sh before building if needed."
+fi
+
+CLEAN="${CLEAN:-0}"
+
+if [[ "$CLEAN" == "1" ]]; then
+  echo "==> Cleaning previous build artifacts"
+  make clean || true
+  rm -f OSTYPE CFLAGS CCTYPE LDFLAGS OSCFLAGS ARCHIVE SPECIALS
+  rm -rf c-client mtest ipopd imapd mailutil mlock dmail tmail rebuild tools/an
+fi
+
+echo "==> Building UW-IMAP: make ${TARGET} SSLTYPE=${SSLTYPE}"
+# UW-IMAP makefiles are not always parallel-safe in all subdirs; use -j carefully.
+# We'll still allow -j, but you can set JOBS=1 if you see race issues.
+make -j"${JOBS}" "${TARGET}" "SSLTYPE=${SSLTYPE}"
+
+echo "Build done."