diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..102095e
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,71 @@
+name: build
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+    tags:
+      - "!*" # Do not execute on tags
+    paths:
+      - "**/*.c"
+      - "**/*.h"
+      - "**/*.sql"
+      - data/**
+      - expected/**
+      - .clangd-format
+      - .github/workflows/**
+      - Makefile
+      - "*.control"
+  pull_request:
+    paths:
+      - "**/*.c"
+      - "**/*.h"
+      - "**/*.sql"
+      - data/**
+      - expected/**
+      - .clangd-format
+      - .github/workflows/**
+      - Makefile
+      - "*.control"
+    branches:
+      - "**"
+env:
+  PGPORT: 5432
+  PGUSER: postgres
+  PGDATABASE: postgres
+  PGPASSWORD: postgres
+  PGHOST: localhost
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Update repositories
+        run: sudo apt -y install wget ca-certificates &&
+          wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add - &&
+          sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" >> /etc/apt/sources.list.d/pgdg.list' &&
+          sudo apt-get --purge remove postgresql &&
+          sudo apt update
+
+      - name: Install postgres
+        run: sudo apt install -y postgresql-16 libpq-dev clang-format postgresql-server-dev-16
+
+      - name: Start Postgres
+        run: sudo systemctl restart postgresql && sleep 5
+
+      - name: Set password
+        run: sudo -u postgres psql -c "ALTER USER postgres WITH PASSWORD 'postgres';"
+
+      - name: Read Postgres version
+        run: sudo -u postgres psql -c "SELECT version();"
+
+      - name: Install
+        run: sudo make install
+
+      - name: Format check
+        run: find . -iname '*.h' -o -iname '*.c' | xargs clang-format --dry-run --Werror
+
+      - name: Run tests
+        run: make installcheck || (cat regression.diffs && exit -1)
diff --git a/README.md b/README.md
index 15bb32f..c1f1203 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![build](https://github.com/carlosganzerla/pg_set/actions/workflows/ci.yml/badge.svg)](https://github.com/carlosganzerla/pg_set/actions/workflows/ci.yml)
+
 # `pg_set`
 
 This extensions adds integer sets to PostgreSQL. It provides a new data type
diff --git a/hash_set.c b/hash_set.c
index 2de1db9..d8ba3ab 100644
--- a/hash_set.c
+++ b/hash_set.c
@@ -1,5 +1,4 @@
 #include "c.h"
-#include "common/int.h"
 #include "pg_set.h"
 #include "varatt.h"
 #define EXPANDED_CAPACITY(capacity_) (capacity_ * 2)
@@ -92,7 +91,7 @@ pg_set_element_cmp(const void *p1, const void *p2)
 	PgSetElement v1 = *((const PgSetElement *) p1);
 	PgSetElement v2 = *((const PgSetElement *) p2);
 
-	return pg_cmp_s32(v1, v2);
+	return CMP(v1, v2);
 }
 
 PgSet *
diff --git a/pg_set.h b/pg_set.h
index 8121996..221d207 100644
--- a/pg_set.h
+++ b/pg_set.h
@@ -79,3 +79,4 @@ ArrayType *cast_to_array(PgSet *args);
 #define PgSetEqualsStrategyNumber 6
 #define PgSetSubsetStrategyNumber 7
 #define PgSetContainsStrategyNumber 13
+#define CMP(a, b) ((a > b) - (a < b));
diff --git a/pg_set_gist.c b/pg_set_gist.c
index 94de372..5d3dd23 100644
--- a/pg_set_gist.c
+++ b/pg_set_gist.c
@@ -1,7 +1,6 @@
 #include "postgres.h"
 #include "access/gist.h"
 #include "access/reloptions.h"
-#include "common/int.h"
 #include "fmgr.h"
 #include "pg_set.h"
 #include "port/pg_bitutils.h"
@@ -682,6 +681,6 @@ calc_penalty(GistPgSet *left, GistPgSet *right, uint32 masklen)
 static int
 comparecost(const void *a, const void *b)
 {
-	return pg_cmp_s32(((const GistSplitCost *) a)->cost,
-					  ((const GistSplitCost *) b)->cost);
+	return CMP(((const GistSplitCost *) a)->cost,
+			   ((const GistSplitCost *) b)->cost);
 }