diff -ur qtdeclarative-opensource-src-5.4.1/src/qml/jsruntime/jsruntime.pri qtdeclarative-opensource-src-5.4.1-no_sse2/src/qml/jsruntime/jsruntime.pri
--- qtdeclarative-opensource-src-5.4.1/src/qml/jsruntime/jsruntime.pri	2015-02-17 05:57:27.000000000 +0100
+++ qtdeclarative-opensource-src-5.4.1-no_sse2/src/qml/jsruntime/jsruntime.pri	2015-04-22 03:28:32.000000000 +0200
@@ -105,6 +105,11 @@
     $$PWD/qv4string.cpp \
     $$PWD/qv4value.cpp
 
+linux-g++*:isEqual(QT_ARCH,i386):!no_sse2 {
+    QMAKE_CFLAGS += -msse2 -mfpmath=sse
+    QMAKE_CXXFLAGS += -msse2 -mfpmath=sse
+}
+
 valgrind {
     DEFINES += V4_USE_VALGRIND
 }
diff -ur qtdeclarative-opensource-src-5.4.1/src/qml/jsruntime/qv4global_p.h qtdeclarative-opensource-src-5.4.1-no_sse2/src/qml/jsruntime/qv4global_p.h
--- qtdeclarative-opensource-src-5.4.1/src/qml/jsruntime/qv4global_p.h	2015-02-17 05:57:27.000000000 +0100
+++ qtdeclarative-opensource-src-5.4.1-no_sse2/src/qml/jsruntime/qv4global_p.h	2015-04-22 03:24:05.000000000 +0200
@@ -69,7 +69,7 @@
 //
 // NOTE: This should match the logic in qv4targetplatform_p.h!
 
-#if defined(Q_PROCESSOR_X86) && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_FREEBSD))
+#if defined(Q_PROCESSOR_X86) && 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) && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_MAC) || defined(Q_OS_FREEBSD))
 #define V4_ENABLE_JIT
diff -ur qtdeclarative-opensource-src-5.4.1/src/qml/qml/v8/qv8engine.cpp qtdeclarative-opensource-src-5.4.1-no_sse2/src/qml/qml/v8/qv8engine.cpp
--- qtdeclarative-opensource-src-5.4.1/src/qml/qml/v8/qv8engine.cpp	2015-02-17 05:57:27.000000000 +0100
+++ qtdeclarative-opensource-src-5.4.1-no_sse2/src/qml/qml/v8/qv8engine.cpp	2015-04-22 03:11:59.000000000 +0200
@@ -121,7 +121,7 @@
     , 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");
     }