-egltest: $(COMMON_SRC) $(COMMON_HDR) eglbackend.cpp eglbackend.h
- g++ $(FLAGS) -DUSE_EGL $(COMMON_SRC) eglbackend.cpp -lEGL -lGL -lX11 -lboost_program_options -o egltest
+# choices (not all combinations are valid)
+# windowing system: WIN_{GLX,EGL}
+# the kind of context: CON_{GL1,GLES2}
+# the API used to draw: compile in glutil_gl1.cpp or glutil_gl2.cpp
+
+glxtest: $(COMMON_SRC) $(COMMON_HDR) glutil_gl1.cpp glxbackend.cpp glxbackend.h
+ g++ $(CFLAGS) -DWIN_GLX -DCON_GL1 $^ -lGL $(COMMON_LD) -o $@
+
+egltest: $(COMMON_SRC) $(COMMON_HDR) glutil_gl1.cpp eglbackend.cpp eglbackend.h
+ g++ $(CFLAGS) -DWIN_EGL -DCON_GL1 $^ -lEGL -lGL $(COMMON_LD) -o $@
+
+glx2test: $(COMMON_SRC) $(COMMON_HDR) glutil_gl2.cpp glxbackend.cpp glxbackend.h
+ g++ $(CFLAGS) -DWIN_GLX -DCON_GL1 $^ -lGL $(COMMON_LD) -o $@
+
+egl2test: $(COMMON_SRC) $(COMMON_HDR) glutil_gl2.cpp eglbackend.cpp eglbackend.h
+ g++ $(CFLAGS) -DWIN_EGL -DCON_GL1 $^ -lEGL -lGL $(COMMON_LD) -o $@
+
+gles2test: $(COMMON_SRC) $(COMMON_HDR) glutil_gl2.cpp eglbackend.cpp eglbackend.h
+ g++ $(CFLAGS) -DWIN_EGL -DCON_GLES2 $^ -lEGL -lGLESv2 $(COMMON_LD) -o $@