Not sure if ARMv7 is mandatory or similar, but it looks to fail downstream with arm5: https://bugs.gentoo.org/show_bug.cgi?id=523400 mv -f Source/JavaScriptCore/llint/.deps/libjavascriptcoregtk_1_0_la-LLIntThunks.Tpo Source/JavaScriptCore/llint/.deps/libjavascriptcoregtk_1_0_la-LLIntThunks.Plo /bin/sh ./libtool --tag=CXX --mode=compile armv5tel-softfloat-linux-gnueabi-g++ -DHAVE_CONFIG_H -I. -Wall -W -Wcast-align -Wchar-subscripts -Wreturn-type -Wformat -Wformat-security -Wno-format-y2k -Wundef -Wmissing-format-attribute -Wpointer-arith -Wwrite-strings -Wno -unused-parameter -Wno-parentheses -fno-exceptions -DBUILDING_CAIRO__ -DBUILDING_GTK__ -I./Source -I./Source/JavaScriptCore -I./Source/JavaScriptCore/API -I./Source/JavaScriptCore/ForwardingHeaders -I./Source/JavaScriptCore/assembler -I./Source/JavaScriptCore/bindings - I./Source/JavaScriptCore/bytecode -I./Source/JavaScriptCore/bytecompiler -I./Source/JavaScriptCore/debugger -I./Source/JavaScriptCore/dfg -I./Source/JavaScriptCore/disassembler -I./Source/JavaScriptCore/ftl -I./Source/JavaScriptCore/heap -I./Source/JavaScriptCore/inspecto r -I./Source/JavaScriptCore/inspector/agents -I./Source/JavaScriptCore/interpreter -I./Source/JavaScriptCore/jit -I./Source/JavaScriptCore/llint -I./Source/JavaScriptCore/parser -I./Source/JavaScriptCore/profiler -I./Source/JavaScriptCore/runtime -I./Source/JavaScriptCore /tools -I./Source/JavaScriptCore/yarr -I./DerivedSources/JavaScriptCore -I./Source/WTF -fno-omit-frame-pointer -fno-tree-dce -fno-rtti -pthread -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include -O2 -march=armv5te -pipe -pthread -std=c++11 -Wno-c++11 -compat -MT Source/JavaScriptCore/llint/libjavascriptcoregtk_1_0_la-LowLevelInterpreter.lo -MD -MP -MF Source/JavaScriptCore/llint/.deps/libjavascriptcoregtk_1_0_la-LowLevelInterpreter.Tpo -c -o Source/JavaScriptCore/llint/libjavascriptcoregtk_1_0_la-LowLevelInterpreter .lo `test -f 'Source/JavaScriptCore/llint/LowLevelInterpreter.cpp' || echo './'`Source/JavaScriptCore/llint/LowLevelInterpreter.cpp libtool: compile: armv5tel-softfloat-linux-gnueabi-g++ -DHAVE_CONFIG_H -I. -Wall -W -Wcast-align -Wchar-subscripts -Wreturn-type -Wformat -Wformat-security -Wno-format-y2k -Wundef -Wmissing-format-attribute -Wpointer-arith -Wwrite-strings -Wno-unused-parameter -Wno-paren theses -fno-exceptions -DBUILDING_CAIRO__ -DBUILDING_GTK__ -I./Source -I./Source/JavaScriptCore -I./Source/JavaScriptCore/API -I./Source/JavaScriptCore/ForwardingHeaders -I./Source/JavaScriptCore/assembler -I./Source/JavaScriptCore/bindings -I./Source/JavaScriptCore/bytec ode -I./Source/JavaScriptCore/bytecompiler -I./Source/JavaScriptCore/debugger -I./Source/JavaScriptCore/dfg -I./Source/JavaScriptCore/disassembler -I./Source/JavaScriptCore/ftl -I./Source/JavaScriptCore/heap -I./Source/JavaScriptCore/inspector -I./Source/JavaScriptCore/in spector/agents -I./Source/JavaScriptCore/interpreter -I./Source/JavaScriptCore/jit -I./Source/JavaScriptCore/llint -I./Source/JavaScriptCore/parser -I./Source/JavaScriptCore/profiler -I./Source/JavaScriptCore/runtime -I./Source/JavaScriptCore/tools -I./Source/JavaScriptCo re/yarr -I./DerivedSources/JavaScriptCore -I./Source/WTF -fno-omit-frame-pointer -fno-tree-dce -fno-rtti -pthread -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include -O2 -march=armv5te -pipe -pthread -std=c++11 -Wno-c++11-compat -MT Source/JavaScriptCore/ll int/libjavascriptcoregtk_1_0_la-LowLevelInterpreter.lo -MD -MP -MF Source/JavaScriptCore/llint/.deps/libjavascriptcoregtk_1_0_la-LowLevelInterpreter.Tpo -c Source/JavaScriptCore/llint/LowLevelInterpreter.cpp -fPIC -DPIC -o Source/JavaScriptCore/llint/.libs/libjavascriptc oregtk_1_0_la-LowLevelInterpreter.o {standard input}: Assembler messages: {standard input}:1533: Error: selected processor does not support ARM mode `vmov s2,r1' {standard input}:1534: Error: selected processor does not support ARM mode `vcvt.f64.s32 d1,s2' {standard input}:1538: Error: selected processor does not support ARM mode `vmov d1,r1,r4' {standard input}:1541: Error: selected processor does not support ARM mode `vmov d0,r0,r2' {standard input}:1542: Error: selected processor does not support ARM mode `vadd.f64 d0,d0,d1' ... make[1]: *** [Source/JavaScriptCore/llint/libjavascriptcoregtk_1_0_la-LowLevelInterpreter.lo] Error 1 make[1]: *** Waiting for unfinished jobs.... mv -f Source/JavaScriptCore/llint/.deps/libjavascriptcoregtk_1_0_la-LLIntSlowPaths.Tpo Source/JavaScriptCore/llint/.deps/libjavascriptcoregtk_1_0_la-LLIntSlowPaths.Plo make[1]: Leaving directory `/var/tmp/portage/net-libs/webkit-gtk-2.4.4-r200/work/webkitgtk-2.4.4' make: *** [all] Error 2