The GCC 13 C++ stdlib doesn't include <stdint.h> any more, which is used for uint32_t.
--- qtwebkit-opensource-src-5.212/Source/ThirdParty/ANGLE/src/common/mathutil.h.old	2020-09-22 06:30:04.000000000 -0500
+++ qtwebkit-opensource-src-5.212/Source/ThirdParty/ANGLE/src/common/mathutil.h	2024-05-27 14:43:22.625301664 -0500
@@ -14,6 +14,7 @@
 
 #include <limits>
 #include <algorithm>
+#include <stdint.h>
 #include <string.h>
 #include <stdlib.h>