diff --git a/srcpkgs/chromium/patches/fix-dawn-platform.patch b/srcpkgs/chromium/patches/fix-dawn-platform.patch
new file mode 100644
index 00000000000..fbcd2706a94
--- /dev/null
+++ b/srcpkgs/chromium/patches/fix-dawn-platform.patch
@@ -0,0 +1,62 @@
+From f815e833c946a59620a2ca9df37a1da746f61460 Mon Sep 17 00:00:00 2001
+From: q66 <daniel@octaforge.org>
+Date: Sat, 1 Oct 2022 00:21:09 +0000
+Subject: [PATCH] fix dawn build for ppc64
+
+---
+ third_party/dawn/src/dawn/common/Assert.cpp |  4 ++--
+ third_party/dawn/src/dawn/common/Platform.h | 10 +++++-----
+ 2 files changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/third_party/dawn/src/dawn/common/Assert.cpp b/third_party/dawn/src/dawn/common/Assert.cpp
+index ecc92dfc..8ee91a90 100644
+--- a/third_party/dawn/src/dawn/common/Assert.cpp
++++ b/third_party/dawn/src/dawn/common/Assert.cpp
+@@ -31,9 +31,9 @@ void BreakPoint() {
+     __asm__ __volatile__("ebreak");
+ #elif DAWN_PLATFORM_IS(MIPS)
+     __asm__ __volatile__("break");
+-#elif DAWN_PLATFORM_IS(S390) || DAWN_PLATFORM_IS_(S390X)
++#elif DAWN_PLATFORM_IS(S390) || DAWN_PLATFORM_IS(S390X)
+     __asm__ __volatile__(".word 0x0001");
+-#elif DAWN_PLATFORM_IS(PPC) || DAWN_PLATFORM_IS_(PPC64)
++#elif DAWN_PLATFORM_IS(PPC) || DAWN_PLATFORM_IS(PPC64)
+     __asm__ __volatile__("twge 2,2");
+ #else
+ #error "Unsupported platform"
+diff --git a/third_party/dawn/src/dawn/common/Platform.h b/third_party/dawn/src/dawn/common/Platform.h
+index 39d5eb41..2011367d 100644
+--- a/third_party/dawn/src/dawn/common/Platform.h
++++ b/third_party/dawn/src/dawn/common/Platform.h
+@@ -124,15 +124,15 @@
+ #define DAWN_PLATFORM_IS_MIPS64 1
+ #endif
+ 
+-#elif defiend(__s390__)
++#elif defined(__s390__)
+ #define DAWN_PLATFORM_IS_S390 1
+-#elif defiend(__s390x__)
++#elif defined(__s390x__)
+ #define DAWN_PLATFORM_IS_S390X 1
+ 
+-#elif defined(__PPC__)
+-#define DAWN_PLATFORM_IS_PPC 1
+ #elif defined(__PPC64__)
+ #define DAWN_PLATFORM_IS_PPC64 1
++#elif defined(__PPC__)
++#define DAWN_PLATFORM_IS_PPC 1
+ 
+ #else
+ #error "Unsupported platform."
+@@ -149,7 +149,7 @@
+ static_assert(sizeof(sizeof(char)) == 8, "Expect sizeof(size_t) == 8");
+ #elif defined(DAWN_PLATFORM_IS_I386) || defined(DAWN_PLATFORM_IS_ARM32) ||   \
+     defined(DAWN_PLATFORM_IS_RISCV32) || defined(DAWN_PLATFORM_IS_MIPS32) || \
+-    defined(DAWN_PLATFORM_IS_S390) || defined(DAWN_PLATFORM_IS_PPC32) ||     \
++    defined(DAWN_PLATFORM_IS_S390) || defined(DAWN_PLATFORM_IS_PPC) ||     \
+     defined(DAWN_PLATFORM_IS_EMSCRIPTEN)
+ #define DAWN_PLATFORM_IS_32_BIT 1
+ static_assert(sizeof(sizeof(char)) == 4, "Expect sizeof(size_t) == 4");
+-- 
+2.34.1
+
diff --git a/srcpkgs/chromium/patches/xxx-ppc64le-support.patch b/srcpkgs/chromium/patches/xxx-ppc64le-support.patch
index 3c2df31566e..475a0067cbf 100644
--- a/srcpkgs/chromium/patches/xxx-ppc64le-support.patch
+++ b/srcpkgs/chromium/patches/xxx-ppc64le-support.patch
@@ -3393,6 +3393,37 @@ index e4ac22644..1c57015db 100644
       (defined(__s390__) && !defined(__s390x__))
      /* On these architectures, implement mmap() with mmap2(). */
      LSS_INLINE void* LSS_NAME(mmap)(void *s, size_t l, int p, int f, int d,
+@@ -4872,11 +4872,11 @@ struct kernel_statx {
+       LSS_SC_BODY(4, int, 8, d, type, protocol, sv);
+     }
+   #endif
+-  #if defined(__NR_recvmsg)
++  #if defined(__NR_recvmsg) && !defined(__PPC__)
+     LSS_INLINE _syscall3(ssize_t, recvmsg, int, s, struct kernel_msghdr*, msg,
+                          int, flags)
+   #endif
+-  #if defined(__NR_sendmsg)
++  #if defined(__NR_sendmsg) && !defined(__PPC__)
+     LSS_INLINE _syscall3(ssize_t, sendmsg, int, s, const struct kernel_msghdr*,
+                          msg, int, flags)
+   #endif
+@@ -4885,13 +4885,13 @@ struct kernel_statx {
+                          int, flags, const struct kernel_sockaddr*, to,
+                          unsigned int, tolen)
+   #endif
+-  #if defined(__NR_shutdown)
++  #if defined(__NR_shutdown) && !defined(__PPC__)
+     LSS_INLINE _syscall2(int, shutdown, int, s, int, how)
+   #endif
+-  #if defined(__NR_socket)
++  #if defined(__NR_socket) && !defined(__PPC__)
+     LSS_INLINE _syscall3(int, socket, int, domain, int, type, int, protocol)
+   #endif
+-  #if defined(__NR_socketpair)
++  #if defined(__NR_socketpair) && !defined(__PPC__)
+     LSS_INLINE _syscall4(int, socketpair, int, d, int, type, int, protocol,
+                          int*, sv)
+   #endif
 diff --git a/third_party/pdfium/third_party/libpng16/pngpriv.h b/third_party/pdfium/third_party/libpng16/pngpriv.h
 index 583c26f..e03d697 100644
 --- a/third_party/pdfium/third_party/libpng16/pngpriv.h