$OpenBSD$
Unbreak build.

See also QBS-1395.
Index: src/lib/corelib/tools/persistence.h
--- src/lib/corelib/tools/persistence.h.orig
+++ src/lib/corelib/tools/persistence.h
@@ -267,27 +267,25 @@ template<typename T> struct PPHelper<T, std::enable_if
     static void load(T &value, PersistentPool *pool) { pool->m_stream >> value; }
 };
 
-template<> struct PPHelper<long>
+template<> struct PPHelper<int32_t>
 {
-    static void store(long value, PersistentPool *pool) { pool->m_stream << qint64(value); }
-    static void load(long &value, PersistentPool *pool)
+    static void store(int32_t value, PersistentPool *pool) { pool->m_stream << qint64(value); }
+    static void load(int32_t &value, PersistentPool *pool)
     {
         qint64 v;
         pool->m_stream >> v;
-        value = long(v);
+        value = int32_t(v);
     }
 };
 
-template<typename T>
-struct PPHelper<T, std::enable_if_t<std::is_same<T, std::time_t>::value
-        && !std::is_same<T, long>::value>>
+template<> struct PPHelper<int64_t>
 {
-    static void store(std::time_t value, PersistentPool *pool) { pool->m_stream << qint64(value); }
-    static void load(std::time_t &value, PersistentPool *pool)
+    static void store(int64_t value, PersistentPool *pool) { pool->m_stream << qint64(value); }
+    static void load(int64_t &value, PersistentPool *pool)
     {
         qint64 v;
         pool->m_stream >> v;
-        value = static_cast<std::time_t>(v);
+        value = static_cast<int64_t>(v);
     }
 };