docs: Added reference to postgresql-server-dev-all as a dependency

readme.md

@@ -20,76 +20,82 @@ PGTFS is a PostgreSQL extension designed to facilitate routing on top of the GTF
 
 1. Clone the PGTFS repository:
 
-```sh
-git clone https://github.com/adrianprelipcean/pgtfs.git
-```
+    ```sh
+    git clone https://github.com/adrianprelipcean/pgtfs.git
+    ```
 
-2. Build and install the extension:
+2. Install the server development packages (e.g., for Ubuntu):
 
-```sh
-cd pgtfs
-make && make install
-```
+    ```sh
+    apt-get install postgresql-server-dev-all
+    ```
 
-3. Enable the extension in your PostgreSQL database:
+3. Build and install the extension:
 
-```sql
-CREATE EXTENSION pgtfs;
-```
+    ```sh
+    cd pgtfs
+    make && make install
+    ```
+
+4. Enable the extension in your PostgreSQL database:
+
+    ```sql
+    CREATE EXTENSION pgtfs;
+    ```
 
 ## Usage
 
 1. Make sure you have imported GTFS data (i used [this GTFS feed](https://www.transit.land/feeds/f-u8-romania~interregionalcalatori~regiotrans~cfrc%C4%83l%C4%83tori~softrans~trans) for this example) in the database you want to test this extension in. At a minimum, you would need data for the following tables.
 
-```sql
-CREATE TABLE IF NOT EXISTS stops (
-    stop_id TEXT PRIMARY KEY,
-    stop_name TEXT,
-    stop_lat DOUBLE PRECISION,
-    stop_lon DOUBLE PRECISION
-);
-
-CREATE TABLE IF NOT EXISTS trips (
-    route_id TEXT,
-    service_id TEXT,
-    trip_id TEXT PRIMARY KEY,
-    trip_short_name TEXT
-);
-
-CREATE TABLE IF NOT EXISTS stop_times (
-    trip_id TEXT,
-    arrival_time INTERVAL,
-    departure_time INTERVAL,
-    stop_id TEXT,
-    stop_sequence INTEGER,
-    PRIMARY KEY (trip_id, stop_sequence),
-    FOREIGN KEY (trip_id) REFERENCES trips (trip_id),
-    FOREIGN KEY (stop_id) REFERENCES stops (stop_id)
-);
-```
+    ```sql
+    CREATE TABLE IF NOT EXISTS stops (
+        stop_id TEXT PRIMARY KEY,
+        stop_name TEXT,
+        stop_lat DOUBLE PRECISION,
+        stop_lon DOUBLE PRECISION
+    );
+
+    CREATE TABLE IF NOT EXISTS trips (
+        route_id TEXT,
+        service_id TEXT,
+        trip_id TEXT PRIMARY KEY,
+        trip_short_name TEXT
+    );
+
+    CREATE TABLE IF NOT EXISTS stop_times (
+        trip_id TEXT,
+        arrival_time INTERVAL,
+        departure_time INTERVAL,
+        stop_id TEXT,
+        stop_sequence INTEGER,
+        PRIMARY KEY (trip_id, stop_sequence),
+        FOREIGN KEY (trip_id) REFERENCES trips (trip_id),
+        FOREIGN KEY (stop_id) REFERENCES stops (stop_id)
+    );
+    ```
 2. Create the PGTFS extension 
 
-```sql
-CREATE EXTENSION pgtfs;
-```
+    ```sql
+    CREATE EXTENSION pgtfs;
+    ```
 
 3. Call the Connection Scan Algorithm function for the route between an origin ('10017') and destination ('55770), given a departure time (this day at 12:00:00 AM) and the GTFS trips. 
 
-```sql
-SELECT *, to_timestamp(arrival_time) FROM pgtfs_csa('10017', '55770', EXTRACT(EPOCH from current_date), 
-'
-    SELECT 
-        trip_id, 
-        stop_id, 
-        EXTRACT(EPOCH FROM current_date+arrival_time) AS arrival_time, 
-        EXTRACT(EPOCH FROM current_date+departure_time) AS departure_time,
-        stop_sequence
-    FROM stop_times 
-    ORDER BY trip_id, stop_sequence
-');
-```
-
-> Note: This example is for demonstrative purposes only, dealing with multi-day trips, timezones and non-gtfs routing is not in scope.
+    ```sql
+    SELECT *, to_timestamp(arrival_time) FROM pgtfs_csa('10017', '55770', EXTRACT(EPOCH from current_date), 
+    '
+        SELECT 
+            trip_id, 
+            stop_id, 
+            EXTRACT(EPOCH FROM current_date+arrival_time) AS arrival_time, 
+            EXTRACT(EPOCH FROM current_date+departure_time) AS departure_time,
+            stop_sequence
+        FROM stop_times 
+        ORDER BY trip_id, stop_sequence
+    ');
+    ```
+
+    > Note: This example is for demonstrative purposes only, dealing with multi-day trips, timezones and non-gtfs routing is not in scope.
 
 ## Important notes