diff -up webkitgtk-2.45.92/Source/ThirdParty/skia/include/private/base/SkFeatures.h.orig webkitgtk-2.45.92/Source/ThirdParty/skia/include/private/base/SkFeatures.h
--- webkitgtk-2.45.92/Source/ThirdParty/skia/include/private/base/SkFeatures.h.orig	2024-09-12 08:22:24.667260964 +0000
+++ webkitgtk-2.45.92/Source/ThirdParty/skia/include/private/base/SkFeatures.h	2024-09-12 08:22:46.616832364 +0000
@@ -69,6 +69,10 @@
   #define SK_CPU_LOONGARCH 1
 #endif
 
+#if defined(__powerpc__) || defined (__powerpc64__)
+  #define SK_CPU_PPC 1
+#endif
+
 /**
  *  SK_CPU_SSE_LEVEL
  *
diff -up webkitgtk-2.45.92/Source/ThirdParty/skia/src/core/SkRasterPipeline.h.orig webkitgtk-2.45.92/Source/ThirdParty/skia/src/core/SkRasterPipeline.h
--- webkitgtk-2.45.92/Source/ThirdParty/skia/src/core/SkRasterPipeline.h.orig	2024-09-12 08:16:25.444163366 +0000
+++ webkitgtk-2.45.92/Source/ThirdParty/skia/src/core/SkRasterPipeline.h	2024-09-12 08:16:43.603797893 +0000
@@ -27,7 +27,7 @@ struct SkImageInfo;
 struct skcms_TransferFunction;
 
 #if __has_cpp_attribute(clang::musttail) && !defined(__EMSCRIPTEN__) && !defined(SK_CPU_ARM32) && \
-        !defined(SK_CPU_LOONGARCH)
+        !defined(SK_CPU_LOONGARCH) && !defined(SK_CPU_PPC)
     #define SK_HAS_MUSTTAIL 1
 #else
     #define SK_HAS_MUSTTAIL 0
diff -up webkitgtk-2.45.92/Source/ThirdParty/skia/modules/skcms/src/skcms_internals.h.orig webkitgtk-2.45.92/Source/ThirdParty/skia/modules/skcms/src/skcms_internals.h
--- webkitgtk-2.45.92/Source/ThirdParty/skia/modules/skcms/src/skcms_internals.h.orig	2024-09-12 08:49:09.985808211 +0000
+++ webkitgtk-2.45.92/Source/ThirdParty/skia/modules/skcms/src/skcms_internals.h	2024-09-12 08:49:19.835612828 +0000
@@ -48,6 +48,7 @@ extern "C" {
                                                  && !defined(__arm__) \
                                                  && !defined(__riscv) \
                                                  && !defined(__loongarch__) \
+                                                 && !defined(__powerpc__) \
                                                  && !defined(_WIN32) && !defined(__SYMBIAN32__)
             #define SKCMS_HAS_MUSTTAIL 1
         #endif
diff -up webkitgtk-2.45.92/Source/WTF/wtf/Compiler.h.orig webkitgtk-2.45.92/Source/WTF/wtf/Compiler.h
--- webkitgtk-2.45.92/Source/WTF/wtf/Compiler.h.orig	2024-09-12 09:14:10.775885415 +0000
+++ webkitgtk-2.45.92/Source/WTF/wtf/Compiler.h	2024-09-12 09:15:27.264379291 +0000
@@ -271,7 +271,7 @@
 /* MUST_TAIL_CALL */
 
 #if !defined(MUST_TAIL_CALL) && defined(__cplusplus) && defined(__has_cpp_attribute)
-#if __has_cpp_attribute(clang::musttail)
+#if __has_cpp_attribute(clang::musttail) && !defined(__powerpc__)
 #define MUST_TAIL_CALL [[clang::musttail]]
 #endif
 #endif