https://salsa.debian.org/webkit-team/webkit/-/blob/wk2/unstable/debian/patches/fix-ftbfs-32bit.patch

From: Alberto Garcia <berto@igalia.com>
Subject: Fix FTBFS on 32-bit architectures without __uint128_t
Forwarded: no
--- webkitgtk.orig/Source/bmalloc/libpas/src/libpas/pas_utils.h
+++ webkitgtk/Source/bmalloc/libpas/src/libpas/pas_utils.h
@@ -948,6 +948,25 @@ static inline uintptr_t pas_pair_high(pa
     return pair.high;
 }
 
+#elif __SIZEOF_POINTER__ == 4
+
+typedef uint64_t pas_pair;
+
+static inline pas_pair pas_pair_create(uintptr_t low, uintptr_t high)
+{
+    return ((pas_pair)low) | ((pas_pair)(high) << 32);
+}
+
+static inline uintptr_t pas_pair_low(pas_pair pair)
+{
+    return pair;
+}
+
+static inline uintptr_t pas_pair_high(pas_pair pair)
+{
+    return pair >> 32;
+}
+
 #else
 
 typedef __uint128_t pas_pair;