--- old/qtcore-5.15.11-r1.ebuild	2024-01-03 16:44:43.191330013 +0100
+++ new/qtcore-5.15.11-r1.ebuild	2024-01-03 16:44:09.287949985 +0100
@@ -14,7 +14,7 @@
 DESCRIPTION="Cross-platform application development framework"
 SLOT=5/${QT5_PV}
 
-IUSE="icu old-kernel"
+IUSE="cpu_flags_x86_sse2 icu old-kernel"
 
 DEPEND="
 	dev-libs/double-conversion:=
@@ -94,6 +94,11 @@
 		-no-feature-getentropy # needs Linux 3.17, bug 669994
 		-no-feature-statx # needs Linux 4.11, bug 672856
 	)
+	# Check for availability of SSE2 and switch off if not available
+	# Fixes compilation failure for x86 machines without sse2
+	use !cpu_flags_x86_sse2 && myconf+=(
+		-no-feature-sse2
+	)
 	qt5-build_src_configure
 }