diff --git a/README.md b/README.md
index 3ff5757..3c1242e 100644
--- a/README.md
+++ b/README.md
@@ -103,11 +103,34 @@ a variable-length type.
 
 ## Installation
 
-To install the extension, run `make install` in the project root. Then, in your
-PostgreSQL connection, execute `CREATE EXTENSION hashset;`.
+To install the extension on any platform, follow these general steps:
+
+1. Ensure you have PostgreSQL installed on your system, including the development files.
+2. Clone the repository.
+3. Navigate to the cloned repository directory.
+4. Compile the extension using `make`.
+5. Install the extension using `sudo make install`.
+6. Run the tests using `make installcheck` (optional).
+
+In your PostgreSQL connection, enable the hashset extension using the following SQL command:
+```sql
+CREATE EXTENSION hashset;
+```
 
 This extension requires PostgreSQL version ?.? or later.
 
+For Ubuntu 22.04.1 LTS, you would run the following commands:
+
+```sh
+sudo apt install postgresql-15 postgresql-server-dev-15 postgresql-client-15
+git clone https://github.com/tvondra/hashset.git
+cd hashset
+make
+sudo make install
+make installcheck
+```
+
+Please note that this project is currently under active development and is not yet considered production-ready.
 
 ## License
 
diff --git a/test/c_tests/test_send_recv.c b/test/c_tests/test_send_recv.c
index 5655b8b..cc7c48a 100644
--- a/test/c_tests/test_send_recv.c
+++ b/test/c_tests/test_send_recv.c
@@ -9,8 +9,16 @@ void exit_nicely(PGconn *conn) {
 
 int main() {
 	/* Connect to database specified by the PGDATABASE environment variable */
-	const char	*conninfo = "host=localhost port=5432";
-	PGconn		*conn = PQconnectdb(conninfo);
+	const char *hostname = getenv("PGHOST");
+	char		conninfo[1024];
+	PGconn	   *conn;
+
+	if (hostname == NULL)
+		hostname = "localhost";
+
+	/* Connect to database specified by the PGDATABASE environment variable */
+	snprintf(conninfo, sizeof(conninfo), "host=%s port=5432", hostname);
+	conn = PQconnectdb(conninfo);
 	if (PQstatus(conn) != CONNECTION_OK) {
 		fprintf(stderr, "Connection to database failed: %s", PQerrorMessage(conn));
 		exit_nicely(conn);
@@ -20,13 +28,13 @@ int main() {
 	PQexec(conn, "CREATE EXTENSION IF NOT EXISTS hashset");
 
 	/* Create temporary table */
-	PQexec(conn, "CREATE TABLE IF NOT EXISTS test_hashset_send_recv (hashset_col hashset)");
+	PQexec(conn, "CREATE TABLE IF NOT EXISTS test_hashset_send_recv (hashset_col int4hashset)");
 
 	/* Enable binary output */
 	PQexec(conn, "SET bytea_output = 'escape'");
 
 	/* Insert dummy data */
-	const char *insert_command = "INSERT INTO test_hashset_send_recv (hashset_col) VALUES ('{1,2,3}'::hashset)";
+	const char *insert_command = "INSERT INTO test_hashset_send_recv (hashset_col) VALUES ('{1,2,3}'::int4hashset)";
 	PGresult *res = PQexec(conn, insert_command);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK) {
 		fprintf(stderr, "INSERT failed: %s", PQerrorMessage(conn));
@@ -64,7 +72,7 @@ int main() {
 	PQclear(res);
 
 	/* Check the data */
-	const char *check_command = "SELECT COUNT(DISTINCT hashset_col::text) AS unique_count, COUNT(*) FROM test_hashset_send_recv";
+	const char *check_command = "SELECT COUNT(DISTINCT hashset_col) AS unique_count, COUNT(*) FROM test_hashset_send_recv";
 	res = PQexec(conn, check_command);
 	if (PQresultStatus(res) != PGRES_TUPLES_OK) {
 		fprintf(stderr, "SELECT failed: %s", PQerrorMessage(conn));