Index: qtwebkit-opensource-src-5.212.0~alpha3/CMakeLists.txt
===================================================================
--- qtwebkit-opensource-src-5.212.0~alpha3.orig/CMakeLists.txt
+++ qtwebkit-opensource-src-5.212.0~alpha3/CMakeLists.txt
@@ -83,6 +83,8 @@ elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR
     set(WTF_CPU_S390 1)
 elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")
     set(WTF_CPU_S390X 1)
+elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64")
+    set(WTF_CPU_RISCV64 1)
 else ()
     message(FATAL_ERROR "Unknown CPU '${LOWERCASE_CMAKE_SYSTEM_PROCESSOR}'")
 endif ()
Index: qtwebkit-opensource-src-5.212.0~alpha3/Source/JavaScriptCore/CMakeLists.txt
===================================================================
--- qtwebkit-opensource-src-5.212.0~alpha3.orig/Source/JavaScriptCore/CMakeLists.txt
+++ qtwebkit-opensource-src-5.212.0~alpha3/Source/JavaScriptCore/CMakeLists.txt
@@ -1288,6 +1288,7 @@ elseif (WTF_CPU_MIPS)
 elseif (WTF_CPU_SH4)
 elseif (WTF_CPU_X86)
 elseif (WTF_CPU_X86_64)
+elseif (WTF_CPU_RISCV64)
     if (MSVC AND ENABLE_JIT)
         add_custom_command(
             OUTPUT ${DERIVED_SOURCES_DIR}/JITStubsMSVC64.obj
Index: qtwebkit-opensource-src-5.212.0~alpha3/Source/WTF/wtf/Platform.h
===================================================================
--- qtwebkit-opensource-src-5.212.0~alpha3.orig/Source/WTF/wtf/Platform.h
+++ qtwebkit-opensource-src-5.212.0~alpha3/Source/WTF/wtf/Platform.h
@@ -176,6 +176,11 @@
 #define WTF_CPU_X86_SSE2 1
 #endif
 
+/* CPU(RISCV64) - RISCV64 */
+#if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64
+#define WTF_CPU_RISCV64 1
+#endif
+
 /* CPU(ARM64) - Apple */
 #if (defined(__arm64__) && defined(__APPLE__)) || defined(__aarch64__)
 #define WTF_CPU_ARM64 1
@@ -707,7 +712,8 @@
     || CPU(S390X) \
     || CPU(MIPS64) \
     || CPU(PPC64) \
-    || CPU(PPC64LE)
+    || CPU(PPC64LE) \
+    || CPU(RISCV64)
 #define USE_JSVALUE64 1
 #else
 #define USE_JSVALUE32_64 1
Index: qtwebkit-opensource-src-5.212.0~alpha3/Source/WTF/wtf/dtoa/utils.h
===================================================================
--- qtwebkit-opensource-src-5.212.0~alpha3.orig/Source/WTF/wtf/dtoa/utils.h
+++ qtwebkit-opensource-src-5.212.0~alpha3/Source/WTF/wtf/dtoa/utils.h
@@ -49,7 +49,7 @@
 defined(__ARMEL__) || \
 defined(_MIPS_ARCH_MIPS32R2)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
-#elif CPU(MIPS) || CPU(MIPS64) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA)
+#elif CPU(MIPS) || CPU(MIPS64) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA) || CPU(RISCV64)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(_M_IX86) || defined(__i386__)
 #if defined(_WIN32)
Index: qtwebkit-opensource-src-5.212.0~alpha3/Source/cmake/OptionsQt.cmake
===================================================================
--- qtwebkit-opensource-src-5.212.0~alpha3.orig/Source/cmake/OptionsQt.cmake
+++ qtwebkit-opensource-src-5.212.0~alpha3/Source/cmake/OptionsQt.cmake
@@ -438,6 +438,7 @@ else ()
     find_package(Sqlite REQUIRED)
 endif ()
 
+set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
 
 if (USE_LIBJPEG)
