--- mandelbulber1.21-1.orig/makefiles/makefile
+++ mandelbulber1.21-1.orig/makefiles/makefile
@@ -5,6 +5,7 @@
 -include ../makefile.init
 
 RM := rm -rf
+CXX ?= g++
 
 # All of the sources participating in the build are defined here
 -include sources.mk
@@ -44,7 +45,7 @@
 mandelbulber: $(OBJS) $(USER_OBJS)
 	@echo 'Building target: $@'
 	@echo 'Invoking: GCC C++ Linker'
-	g++ -o"mandelbulber" -L/usr/lib/x86_64-linux-gnu/ $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $(OBJS) $(USER_OBJS) $(LIBS)
+	$(CXX) -o"mandelbulber" -L/usr/lib/x86_64-linux-gnu/ $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $(OBJS) $(USER_OBJS) $(LIBS)
 	@echo 'Finished building target: $@'
 	@echo ' '
 
--- mandelbulber1.21-1.orig/makefiles/src/subdir.mk
+++ mandelbulber1.21-1.orig/makefiles/src/subdir.mk
@@ -71,7 +71,7 @@
 src/%.o: ../src/%.cpp
 	@echo 'Building file: $<'
 	@echo 'Invoking: GCC C++ Compiler'
-	g++ -O3 -ffast-math -Wall -c -fmessage-length=0 `pkg-config --cflags gtk+-2.0 gthread-2.0;` -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" $(CXXFLAGS) $(CPPFLAGS) -o"$@" "$<"
+	$(CXX) -Wall -c -fmessage-length=0 `pkg-config --cflags gtk+-2.0 gthread-2.0;` -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" $(CXXFLAGS) $(CPPFLAGS) -o"$@" "$<"
 	@echo 'Finished building: $<'
 	@echo ' '