tools: add RPM prepare and external-install helper scripts (ArcGIS, GeographicLib, RTI)

app/build_geographiclib.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# build_geographiclib.sh
+# Build and install GeographicLib from source into /usr/local
+
+GIT_REPO=${1:-https://github.com/GeographicLib/GeographicLib.git}
+INSTALL_PREFIX=${2:-/usr/local}
+
+echo "Cloning GeographicLib from $GIT_REPO"
+TMP=$(mktemp -d)
+trap 'rm -rf "$TMP"' EXIT
+
+git clone --depth 1 "$GIT_REPO" "$TMP/GeographicLib"
+mkdir -p "$TMP/GeographicLib/build"
+pushd "$TMP/GeographicLib/build" >/dev/null
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$INSTALL_PREFIX"
+make -j$(nproc)
+sudo make install
+popd >/dev/null
+
+echo "GeographicLib installed to $INSTALL_PREFIX"