diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d986c660..4a50ca4f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,6 +40,11 @@ jobs:
                 librdkafka: 'v1.9.2'
                 memcheck: '1'
 
+              # X32
+              - php: '8.3.0'
+                librdkafka: 'v2.6.0'
+                arch: 'X32'
+
               # Latest librdkafka 2.x
               - php: '8.3.0'
                 librdkafka: 'v2.3.0'
@@ -172,6 +177,7 @@ jobs:
             SKIP_OAUTH: ${{ matrix.skipoauth }}
             TEST_KAFKA_BROKERS: kafka:9092
             TEST_KAFKA_BROKER_VERSION: 2.6
+            ARCH: ${{ matrix.arch }}
         steps:
             - name: 'Check out repository'
               uses: 'actions/checkout@v2'
@@ -181,12 +187,15 @@ jobs:
             - uses: actions/cache@v2
               with:
                   path: ~/build-cache/php
-                  key: ${{ runner.os }}-${{ matrix.php }}-${{ matrix.memcheck }}
+                  key: ${{ runner.os }}-${{ matrix.arch }}-${{ matrix.php }}-${{ matrix.memcheck }}
 
             - uses: actions/cache@v2
               with:
                   path: ~/build-cache/librdkafka
-                  key: ${{ runner.os }}-${{ matrix.librdkafka }}
+                  key: ${{ runner.os }}-${{ matrix.arch }}-${{ matrix.librdkafka }}
+
+            - name: 'Install dependencies'
+              run: './php-rdkafka/.github/workflows/test/install-dependencies.sh'
 
             - name: 'Build librdkafka'
               run: './php-rdkafka/.github/workflows/test/build-librdkafka.sh'
diff --git a/.github/workflows/test/build-librdkafka.sh b/.github/workflows/test/build-librdkafka.sh
index 7674b7d6..adbcb870 100755
--- a/.github/workflows/test/build-librdkafka.sh
+++ b/.github/workflows/test/build-librdkafka.sh
@@ -7,9 +7,19 @@ if ! [ -f ~/build-cache/librdkafka/usr/local/include/librdkafka/rdkafka.h ] || !
 
     git clone --depth 1 --branch "${LIBRDKAFKA_VERSION:-v2.3.0}" "${LIBRDKAFKA_REPOSITORY_URL:-https://github.com/edenhill/librdkafka.git}"
 
+    LIBRDKAFKA_BUILD_FLAGS=
+
+    if [ "$ARCH" = "X32" ]; then
+        export CC="${CC:-gcc} -m32"
+        export CFLAGS="$CFLAGS -m32"
+        export CXXFLAGS="$CXXFLAGS -m32"
+        export LDFLAGS="$LDFLAGS -m32"
+        LIBRDKAFKA_BUILD_FLAGS="$LIBRDKAFKA_BUILD_FLAGS --build=i686-pc-linux-gnu"
+    fi
+
     cd librdkafka
-    ./configure
-    make
+    ./configure $LIBRDKAFKA_BUILD_FLAGS
+    make -j $(nproc)
     mkdir -p ~/build-cache/librdkafka
     sudo make install DESTDIR=$HOME/build-cache/librdkafka
     test -f ~/build-cache/librdkafka/usr/local/include/librdkafka/rdkafka.h || echo "librdkafka build failed"
@@ -22,7 +32,7 @@ if ! [ -f ~/build-cache/librdkafka/usr/local/include/librdkafka/rdkafka.h ] || !
 
     cd kafkacat
     ./configure
-    make
+    make -j $(nproc)
     sudo make install DESTDIR=$HOME/build-cache/librdkafka
 
 else
diff --git a/.github/workflows/test/build-php-rdkafka.sh b/.github/workflows/test/build-php-rdkafka.sh
index acf09a6d..0245c8ca 100755
--- a/.github/workflows/test/build-php-rdkafka.sh
+++ b/.github/workflows/test/build-php-rdkafka.sh
@@ -11,10 +11,17 @@ PACKAGE_VERSION="$(grep -m 1 '<release>' package.xml|cut -d'>' -f2|cut -d'<' -f1
 
 pecl package
 
-if [ $MEMORY_CHECK -eq 1 ]; then
-    PHP_RDKAFKA_CFLAGS="-Wall -Werror -Wno-deprecated-declarations"
+if [ $MEMORY_CHECK -eq 1 ] || [ "$ARCH" = "X32" ]; then
+    export CFLAGS="$CFLAGS -Wall -Werror -Wno-deprecated-declarations"
 fi
 
-sudo CFLAGS="$PHP_RDKAFKA_CFLAGS" pecl install "./rdkafka-$PACKAGE_VERSION.tgz"
+if [ "$ARCH" = "X32" ]; then
+    export CC="${CC:-gcc} -m32"
+    export CFLAGS="$CFLAGS -m32"
+    export CXXFLAGS="$CXXFLAGS -m32"
+    export LDFLAGS="$LDFLAGS -m32"
+fi
+
+sudo -E pecl install "./rdkafka-$PACKAGE_VERSION.tgz"
 
 echo "extension=rdkafka.so"|sudo tee /usr/local/etc/php/rdkafka.ini >/dev/null
diff --git a/.github/workflows/test/build-php.sh b/.github/workflows/test/build-php.sh
index e8d4cecc..76f008f6 100755
--- a/.github/workflows/test/build-php.sh
+++ b/.github/workflows/test/build-php.sh
@@ -2,10 +2,6 @@
 
 set -ex
 
-if [ $MEMORY_CHECK -eq 1 ]; then
-    sudo apt-get -y install valgrind
-fi
-
 if ! [ -f ~/build-cache/php/usr/local/bin/php ]; then
     echo "PHP build is not cached"
     
@@ -29,6 +25,14 @@ if ! [ -f ~/build-cache/php/usr/local/bin/php ]; then
         esac
     fi
 
+    if [ "$ARCH" = "X32" ]; then
+        export CC="${CC:-gcc} -m32"
+        export CFLAGS="$CFLAGS -m32"
+        export CXXFLAGS="$CXXFLAGS -m32"
+        export LDFLAGS="$LDFLAGS -m32"
+        PHP_BUILD_FLAGS="$PHP_BUILD_FLAGS --build=i686-pc-linux-gnu"
+    fi
+
     ./configure $PHP_BUILD_FLAGS $PHP_BUILD_EXTRA_FLAGS
     make -j $(nproc)
     mkdir -p ~/build-cache/php
diff --git a/.github/workflows/test/install-dependencies.sh b/.github/workflows/test/install-dependencies.sh
new file mode 100755
index 00000000..45f4d638
--- /dev/null
+++ b/.github/workflows/test/install-dependencies.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+set -ex
+
+export DEBIAN_FRONTEND=noninteractive
+
+DEPS="zlib1g-dev libssl-dev"
+
+if [ "$ARCH" = "X32" ]; then
+    sudo dpkg --add-architecture i386
+    sudo apt-get update
+    DEPS="$DEPS gcc-multilib g++-multilib zlib1g-dev:i386 libssl-dev:i386"
+fi
+
+if [ "$MEMORY_CHECK" = "1" ]; then
+    DEPS="$DEPS valgrind"
+fi
+
+if [ -n "$DEPS" ]; then
+    sudo apt-get -y install $DEPS
+fi
diff --git a/conf.c b/conf.c
index 9aa8132f..6330e62e 100644
--- a/conf.c
+++ b/conf.c
@@ -340,6 +340,7 @@ static void kafka_conf_log_cb(const rd_kafka_t *rk, int level, const char *facil
     zval_ptr_dtor(&args[3]);
 }
 
+#ifdef HAS_RD_KAFKA_OAUTHBEARER
 /* 
 void rd_kafka_conf_set_oauthbearer_token_refresh_cb(
     rd_kafka_conf_t *conf,
@@ -371,8 +372,7 @@ static void kafka_conf_set_oauthbearer_token_refresh_cb(rd_kafka_t *rk, const ch
     zval_ptr_dtor(&args[0]);
     zval_ptr_dtor(&args[1]);
 }
-
-
+#endif
 
 /* {{{ proto RdKafka\Conf::__construct() */
 PHP_METHOD(RdKafka_Conf, __construct)