As found by Peter Kay on misc, qt5 detects CPU features to enable
at build time, so produces binaries that don't work everywhere.
Does this seem a reasonable set to disable?
Index: Makefile
===================================================================
RCS file: /cvs/ports/x11/qt5/Makefile,v
retrieving revision 1.48
diff -u -p -r1.48 Makefile
--- Makefile 6 Mar 2016 11:56:41 -0000 1.48
+++ Makefile 16 Mar 2016 09:33:26 -0000
@@ -4,6 +4,7 @@ SHARED_ONLY = Yes
ONLY_FOR_ARCHS = ${GCC4_ARCHS}
VERSION = 5.5.1
+REVISION = 0
ENGINIO_VERSION = 1.2.1
DISTNAME = qt-everywhere-opensource-src-${VERSION}
@@ -299,6 +300,15 @@ CONFIGURE_ENV = MAKE=make \
.if ${MACHINE_ARCH} == "powerpc"
CONFIGURE_ENV += LDFLAGS="-Wl,--relax"
.endif
+
+.if ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386"
+CONFIGURE_ARGS += -no-ssse3 -no-sse4.1 -no-sse4.2 -no-avx -no-avx2
+.endif
+
+.if ${MACHINE_ARCH} == "i386"
+CONFIGURE_ARGS += -no-sse2 -no-sse3
+.endif
+
.include <bsd.port.arch.mk>
# QtWebkit (at least, maybe others) plays dirty games with inter-target
