diff -up qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/jsruntime.pri.no_sse2 qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/jsruntime.pri
--- qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/jsruntime.pri.no_sse2	2018-04-30 06:54:03.000000000 -0500
+++ qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/jsruntime.pri	2018-05-24 16:15:51.151738531 -0500
@@ -115,6 +115,11 @@ SOURCES += \
     $$PWD/qv4value.cpp \
     $$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
 }
diff -up qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/qv4global_p.h.no_sse2 qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/qv4global_p.h
--- qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/qv4global_p.h.no_sse2	2018-04-30 06:54:03.000000000 -0500
+++ qtdeclarative-everywhere-src-5.11.0/src/qml/jsruntime/qv4global_p.h	2018-05-24 20:23:38.642642420 -0500
@@ -88,7 +88,7 @@ inline double trunc(double d) { return d
 //
 // 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) \
diff -up qtdeclarative-everywhere-src-5.11.0/src/qml/qml/v8/qv8engine.cpp.no_sse2 qtdeclarative-everywhere-src-5.11.0/src/qml/qml/v8/qv8engine.cpp
--- qtdeclarative-everywhere-src-5.11.0/src/qml/qml/v8/qv8engine.cpp.no_sse2	2018-05-24 16:15:51.152738550 -0500
+++ qtdeclarative-everywhere-src-5.11.0/src/qml/qml/v8/qv8engine.cpp	2018-05-24 20:21:01.273574503 -0500
@@ -131,7 +131,7 @@ QV8Engine::QV8Engine(QJSEngine *qq, QV4:
 {
 #ifdef Q_PROCESSOR_X86_32
     if (!qCpuHasFeature(SSE2)) {
-        qFatal("This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer");
+        qDebug("This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer, processors missing the extension are NOT supported to run QML2 code!");
     }
 #endif