--- qt-everywhere-src-6.9.3/qtdeclarative/src/qml/memory/qv4stacklimits.cpp.orig
+++ qt-everywhere-src-6.9.3/qtdeclarative/src/qml/memory/qv4stacklimits.cpp
@@ -253,7 +253,7 @@
 
     pthread_t thread = pthread_self();
     pthread_attr_t sattr;
-#  if defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(Q_OS_NETBSD)
+#  if defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(Q_OS_NETBSD) || defined(Q_OS_SOLARIS)
     pthread_attr_init(&sattr);
     pthread_attr_get_np(thread, &sattr);
 #  else