diff --git a/script/check-posix-build-autotools b/script/check-posix-build-autotools
index 17cf4ad11..67522519a 100755
--- a/script/check-posix-build-autotools
+++ b/script/check-posix-build-autotools
@@ -42,6 +42,15 @@ build()
     if [[ $OSTYPE != "darwin"* ]]; then
         reset_source
         make -f src/posix/Makefile-posix RCP_RESTORATION_MAX_COUNT=2 RCP_BUS=spi
+
+        reset_source
+        ./tests/toranj/build.sh posix
+
+        reset_source
+        ./tests/toranj/build.sh posix-15.4+trel
+
+        reset_source
+        ./tests/toranj/build.sh posix-trel
     fi
 }
 
diff --git a/script/check-posix-build-cmake b/script/check-posix-build-cmake
index 84649cdbf..11d8b95a7 100755
--- a/script/check-posix-build-cmake
+++ b/script/check-posix-build-cmake
@@ -45,6 +45,13 @@ build()
     )
 
     "$(dirname "$0")"/cmake-build posix "${options[@]}"
+
+    options+=(
+        "-DOT_TREL=ON"
+    )
+
+    reset_source
+    "$(dirname "$0")"/cmake-build posix "${options[@]}"
 }
 
 main()
diff --git a/src/posix/platform/trel_udp6.cpp b/src/posix/platform/trel_udp6.cpp
index 5710f12f8..d18684377 100644
--- a/src/posix/platform/trel_udp6.cpp
+++ b/src/posix/platform/trel_udp6.cpp
@@ -109,12 +109,12 @@ static const char *BufferToString(const uint8_t *aBuffer, uint16_t aLength)
     char *   cur = &string[0];
     char *   end = &string[sizeof(string) - 1];
 
-    cur += snprintf(cur, end - cur, "[(len:%d) ", aLength);
+    cur += snprintf(cur, (uint16_t)(end - cur), "[(len:%d) ", aLength);
     VerifyOrExit(cur < end);
 
     while (aLength-- && (num < kMaxWrite))
     {
-        cur += snprintf(cur, end - cur, "%02x ", *aBuffer++);
+        cur += snprintf(cur, (uint16_t)(end - cur), "%02x ", *aBuffer++);
         VerifyOrExit(cur < end);
 
         num++;
@@ -122,7 +122,7 @@ static const char *BufferToString(const uint8_t *aBuffer, uint16_t aLength)
 
     if (aLength != 0)
     {
-        cur += snprintf(cur, end - cur, "... ");
+        cur += snprintf(cur, (uint16_t)(end - cur), "... ");
         VerifyOrExit(cur < end);
     }
 
@@ -168,7 +168,7 @@ static void UpdateUnicastAddress(const otIp6Address *aUnicastAddress, bool aToAd
     request.ifa.ifa_prefixlen = TREL_UNICAST_ADDRESS_PREFIX_LEN;
     request.ifa.ifa_flags     = IFA_F_NODAD;
     request.ifa.ifa_scope     = TREL_UNICAST_ADDRESS_SCOPE;
-    request.ifa.ifa_index     = sInterfaceIndex;
+    request.ifa.ifa_index     = (unsigned int)(sInterfaceIndex);
 
     rta = reinterpret_cast<struct rtattr *>((reinterpret_cast<char *>(&request)) + NLMSG_ALIGN(request.nh.nlmsg_len));
     rta->rta_type = IFA_LOCAL;
diff --git a/tests/toranj/build.sh b/tests/toranj/build.sh
index 3dd4dde5d..adcb71c32 100755
--- a/tests/toranj/build.sh
+++ b/tests/toranj/build.sh
@@ -100,6 +100,14 @@ configure_options=(
     "--enable-ncp"
 )
 
+posix_configure_options=(
+    "--disable-docs"
+    "--enable-tests=$tests"
+    "--enable-coverage=$coverage"
+    "--enable-ftd"
+    "--enable-cli"
+)
+
 if [ -n "${top_builddir}" ]; then
     top_srcdir=$(pwd)
     mkdir -p "${top_builddir}"
@@ -202,7 +210,7 @@ case ${build_config} in
         ${top_srcdir}/configure \
             CPPFLAGS="$cppflags_config" \
             --with-platform=posix \
-            "${configure_options[@]}" || die
+            "${posix_configure_options[@]}" || die
         make -j 8 || die
         ;;
 
@@ -218,7 +226,7 @@ case ${build_config} in
         ${top_srcdir}/configure \
             CPPFLAGS="$cppflags_config" \
             --with-platform=posix \
-            "${configure_options[@]}" || die
+            "${posix_configure_options[@]}" || die
         make -j 8 || die
         ;;
 
@@ -234,7 +242,7 @@ case ${build_config} in
         ${top_srcdir}/configure \
             CPPFLAGS="$cppflags_config" \
             --with-platform=posix \
-            "${configure_options[@]}" || die
+            "${posix_configure_options[@]}" || die
         make -j 8 || die
         ;;
 
@@ -250,7 +258,7 @@ case ${build_config} in
         ${top_srcdir}/configure \
             CPPFLAGS="$cppflags_config" \
             --with-platform=posix \
-            "${configure_options[@]}" || die
+            "${posix_configure_options[@]}" || die
         make -j 8 || die
         ;;
 
diff --git a/tests/toranj/openthread-core-toranj-config-posix.h b/tests/toranj/openthread-core-toranj-config-posix.h
index fb411377b..8a2c58fbb 100644
--- a/tests/toranj/openthread-core-toranj-config-posix.h
+++ b/tests/toranj/openthread-core-toranj-config-posix.h
@@ -45,6 +45,14 @@
  */
 #define OPENTHREAD_CONFIG_PLATFORM_INFO "POSIX-toranj"
 
+/**
+ * @def OPENTHREAD_CONFIG_LOG_OUTPUT
+ *
+ * Selects if, and where the LOG output goes to.
+ *
+ */
+#define OPENTHREAD_CONFIG_LOG_OUTPUT OPENTHREAD_CONFIG_LOG_OUTPUT_PLATFORM_DEFINED
+
 /**
  * @def OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
  *
diff --git a/tests/toranj/openthread-core-toranj-config-simulation.h b/tests/toranj/openthread-core-toranj-config-simulation.h
index 7b6887375..ea97044b1 100644
--- a/tests/toranj/openthread-core-toranj-config-simulation.h
+++ b/tests/toranj/openthread-core-toranj-config-simulation.h
@@ -59,4 +59,12 @@
  */
 #define OPENTHREAD_CONFIG_PLATFORM_FLASH_API_ENABLE 1
 
+/**
+ * @def OPENTHREAD_CONFIG_LOG_OUTPUT
+ *
+ * Selects if, and where the LOG output goes to.
+ *
+ */
+#define OPENTHREAD_CONFIG_LOG_OUTPUT OPENTHREAD_CONFIG_LOG_OUTPUT_APP
+
 #endif /* OPENTHREAD_CORE_TORANJ_CONFIG_SIMULATION_H_ */
diff --git a/tests/toranj/openthread-core-toranj-config.h b/tests/toranj/openthread-core-toranj-config.h
index 18c30723b..bd4d063d1 100644
--- a/tests/toranj/openthread-core-toranj-config.h
+++ b/tests/toranj/openthread-core-toranj-config.h
@@ -256,14 +256,6 @@
  */
 #define OPENTHREAD_CONFIG_MAC_FILTER_SIZE 80
 
-/**
- * @def OPENTHREAD_CONFIG_LOG_OUTPUT
- *
- * Selects if, and where the LOG output goes to.
- *
- */
-#define OPENTHREAD_CONFIG_LOG_OUTPUT OPENTHREAD_CONFIG_LOG_OUTPUT_APP
-
 /**
  * @def OPENTHREAD_CONFIG_LOG_LEVEL
  *