diff -Nru a/src/qml/jsruntime/jsruntime.pri b/src/qml/jsruntime/jsruntime.pri
--- a/src/qml/jsruntime/jsruntime.pri	2018-11-19 15:39:18.000000000 +0100
+++ b/src/qml/jsruntime/jsruntime.pri	2018-12-12 16:27:14.172972825 +0100
@@ -156,6 +156,11 @@
     $$PWD/qv4value.cpp \
     $$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
 }
diff -Nru a/src/qml/jsruntime/qv4global_p.h b/src/qml/jsruntime/qv4global_p.h
--- a/src/qml/jsruntime/qv4global_p.h	2018-11-19 15:39:18.000000000 +0100
+++ b/src/qml/jsruntime/qv4global_p.h	2018-12-12 16:28:11.706289922 +0100
@@ -88,7 +88,7 @@
 //
 // 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) \
diff -Nru a/src/qml/qml/v8/qv8engine.cpp b/src/qml/qml/v8/qv8engine.cpp
--- a/src/qml/qml/v8/qv8engine.cpp	2018-11-19 15:39:18.000000000 +0100
+++ b/src/qml/qml/v8/qv8engine.cpp	2018-12-12 16:30:31.763065226 +0100
@@ -141,7 +141,7 @@
 #ifndef Q_OS_WASM // wasm does not have working simd QTBUG-63924
 #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
 #endif