--- external/oxen-mq/cmake/local-libzmq/LocalLibzmq.cmake
+++ external/oxen-mq/cmake/local-libzmq/LocalLibzmq.cmake	2026-06-12 17:33:46.000000000 +0800
@@ -32,6 +32,7 @@
     -DCMAKE_BUILD_TYPE=Release
     -DWITH_LIBSODIUM=ON -DZMQ_BUILD_TESTS=OFF -DWITH_PERF_TOOL=OFF -DENABLE_DRAFTS=OFF
     -DBUILD_SHARED=OFF -DBUILD_STATIC=ON -DWITH_DOC=OFF -DCMAKE_INSTALL_PREFIX=${LIBZMQ_PREFIX}
+    -DHAVE_STRNLEN=1
     BUILD_BYPRODUCTS ${LIBZMQ_PREFIX}/${CMAKE_INSTALL_LIBDIR}/libzmq.a
     )