diff -Naur a/higan/GNUmakefile b/higan/GNUmakefile
--- a/higan/GNUmakefile	2017-08-11 06:03:07.000000000 -0400
+++ b/higan/GNUmakefile	2017-09-21 15:45:07.561964734 -0400
@@ -19,7 +19,7 @@
 else ifeq ($(platform),macosx)
   flags += -march=native
 else ifneq ($(filter $(platform),linux bsd),)
-  flags += -march=native -fopenmp
+  flags += -fopenmp
   link += -fopenmp
   link += -Wl,-export-dynamic
   link += -lX11 -lXext
@@ -30,9 +30,9 @@
 compile = \
   $(strip \
     $(if $(filter %.c,$<), \
-      $(compiler) $(cflags) $(flags) $1 -c $< -o $@, \
+      $(compiler) $(cflags) $(flags) $(CFLAGS) $1 -c $< -o $@, \
       $(if $(filter %.cpp,$<), \
-        $(compiler) $(cppflags) $(flags) $1 -c $< -o $@ \
+        $(compiler) $(cppflags) $(flags) $(CXXFLAGS) $1 -c $< -o $@ \
       ) \
     ) \
   )
diff -Naur a/higan/target-tomoko/GNUmakefile b/higan/target-tomoko/GNUmakefile
--- a/higan/target-tomoko/GNUmakefile	2017-07-28 03:41:22.000000000 -0400
+++ b/higan/target-tomoko/GNUmakefile	2017-09-21 15:46:18.861960790 -0400
@@ -48,10 +48,10 @@
 objects := $(patsubst %,obj/%.o,$(objects))
 
 obj/ruby.o: ../ruby/ruby.cpp $(call rwildcard,../ruby/)
-	$(compiler) $(rubyflags) -c $< -o $@
+	$(compiler) $(rubyflags) $(CXXFLAGS) -c $< -o $@
 
 obj/hiro.o: ../hiro/hiro.cpp $(call rwildcard,../hiro/)
-	$(compiler) $(hiroflags) -c $< -o $@
+	$(compiler) $(hiroflags) $(CXXFLAGS) -c $< -o $@
 
 obj/ui-tomoko.o: $(ui)/tomoko.cpp $(call rwildcard,$(ui)/)
 obj/ui-program.o: $(ui)/program/program.cpp $(call rwildcard,$(ui)/)
@@ -67,7 +67,7 @@
 
 # targets
 build: $(objects)
-	$(strip $(compiler) -o out/$(name) $(objects) $(link))
+	$(strip $(CXX) $(CXXFLAGS) -o out/$(name) $(objects) $(link))
 ifeq ($(platform),macosx)
 	@if [ -d out/$(name).app ]; then rm -r out/$(name).app; fi
 	mkdir -p out/$(name).app/Contents/MacOS/
diff -Naur a/icarus/GNUmakefile b/icarus/GNUmakefile
--- a/icarus/GNUmakefile	2017-07-30 03:32:34.000000000 -0400
+++ b/icarus/GNUmakefile	2017-09-21 15:48:41.750952887 -0400
@@ -3,7 +3,7 @@
 include ../hiro/GNUmakefile
 
 name := icarus
-flags += -I..
+flags += -I.. $(CXXFLAGS)
 link +=
 
 ifeq ($(platform),windows)
@@ -15,7 +15,7 @@
 objects += $(if $(call streq,$(platform),windows),obj/resource.o)
 
 all: $(objects)
-	$(strip $(compiler) -o out/$(name) $(objects) $(link) $(hirolink))
+	$(strip $(compiler) -o out/$(name) $(objects) $(link) $(hirolink) $(LDFLAGS))
 ifeq ($(platform),macosx)
 	@if [ -d out/$(name).app ]; then rm -r out/$(name).app; fi
 	mkdir -p out/$(name).app/Contents/MacOS/