diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index d84bdb7..5381001 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -4411,16 +4411,21 @@
     msg "MBEDTLS_AES_USE_HARDWARE_ONLY, clang, thumb"
     make -B library/aesce.o CC=clang CFLAGS="--target=arm-linux-gnueabihf -mcpu=cortex-a32+crypto -mthumb"
 
-    scripts/config.py unset MBEDTLS_AES_USE_HARDWARE_ONLY
+    # we need asm/hwcap.h available for runtime detection
+    if (echo '#include <asm/hwcap.h>' | clang -E - >/dev/null 2>&1); then
+        scripts/config.py unset MBEDTLS_AES_USE_HARDWARE_ONLY
 
-    msg "no MBEDTLS_AES_USE_HARDWARE_ONLY, clang, aarch64"
-    make -B library/aesce.o CC=clang CFLAGS="--target=aarch64-linux-gnu -march=armv8-a+crypto"
+        msg "no MBEDTLS_AES_USE_HARDWARE_ONLY, clang, aarch64"
+        make -B library/aesce.o CC=clang CFLAGS="--target=aarch64-linux-gnu -march=armv8-a+crypto"
 
-    msg "no MBEDTLS_AES_USE_HARDWARE_ONLY, clang, arm"
-    make -B library/aesce.o CC=clang CFLAGS="--target=arm-linux-gnueabihf -mcpu=cortex-a72+crypto -marm"
+        msg "no MBEDTLS_AES_USE_HARDWARE_ONLY, clang, arm"
+        make -B library/aesce.o CC=clang CFLAGS="--target=arm-linux-gnueabihf -mcpu=cortex-a72+crypto -marm"
 
-    msg "no MBEDTLS_AES_USE_HARDWARE_ONLY, clang, thumb"
-    make -B library/aesce.o CC=clang CFLAGS="--target=arm-linux-gnueabihf -mcpu=cortex-a32+crypto -mthumb"
+        msg "no MBEDTLS_AES_USE_HARDWARE_ONLY, clang, thumb"
+        make -B library/aesce.o CC=clang CFLAGS="--target=arm-linux-gnueabihf -mcpu=cortex-a32+crypto -mthumb"
+    else
+        msg "can't include <asm/hwcap.h> - skipping runtime detection tests"
+    fi
 }
 
 support_build_sha_armce() {