--- qt-everywhere-src-5.15.18/qtbase/src/corelib/global/qrandom.cpp.orig
+++ qt-everywhere-src-5.15.18/qtbase/src/corelib/global/qrandom.cpp
@@ -277,7 +277,7 @@
     if (quint32 v = seed.loadRelaxed())
         *end++ = v; // 6
 
-#if QT_CONFIG(getauxval)
+#if QT_CONFIG(getauxval) && !__sun
     // works on Linux -- all modern libc have getauxval
 #  ifdef AT_RANDOM
     // ELF's auxv AT_RANDOM has 16 random bytes