--- qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/qv4global_p.h	2017-04-21 20:34:05.000000000 +0200
+++ qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/qv4global_p.h.new	2017-05-06 09:23:00.894049064 +0200
@@ -95,7 +95,7 @@
 //
 // NOTE: This should match the logic in qv4targetplatform_p.h!
 
-#if defined(Q_PROCESSOR_X86) && (QT_POINTER_SIZE == 4) \
+#if defined(Q_PROCESSOR_X86) && (QT_POINTER_SIZE == 4) && defined(__SSE2__) \
     && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_FREEBSD))
 #  define V4_ENABLE_JIT
 #elif defined(Q_PROCESSOR_X86_64) && (QT_POINTER_SIZE == 8) \
--- qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/jsruntime.pri	2017-04-21 20:34:05.000000000 +0200
+++ qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/jsruntime.pri.new	2017-05-06 09:25:12.698437577 +0200
@@ -115,6 +115,11 @@
     $$PWD/qv4value.cpp \
     $$PWD/qv4executableallocator.cpp
 
+linux-g++*:isEqual(QT_ARCH,i386):!no_sse2 {
+    QMAKE_CFLAGS += -msse2 -mfpmath=sse
+    QMAKE_CXXFLAGS += -msse2 -mfpmath=sse
+}
+
 valgrind {
     DEFINES += V4_USE_VALGRIND
 }
--- qtdeclarative-opensource-src-5.9.0-beta3/src/qml/qml/v8/qv8engine.cpp	2017-04-21 20:34:05.000000000 +0200
+++ qtdeclarative-opensource-src-5.9.0-beta3/src/qml/qml/v8/qv8engine.cpp.new	2017-05-06 09:27:19.373810971 +0200
@@ -129,7 +129,7 @@
     , m_xmlHttpRequestData(0)
     , m_listModelData(0)
 {
-#ifdef Q_PROCESSOR_X86_32
+#if defined(Q_PROCESSOR_X86_32) && defined(__SSE2__)
     if (!qCpuHasFeature(SSE2)) {
         qFatal("This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer");
     }