name it MakefileSimple put it in VKDF_HOME, builds the lib and the data/spirv shaders, generates framework/config.h To run it see the comments.

Makefile

src = $(filter-out %-sdl.cpp %-glfw.cpp, $(wildcard framework/*.cpp))
obj = $(src:.cpp=.o)
dep = $(obj:.o=.d)
lib_so = libvkdf.so

spv = $(patsubst %.input,%.spv,$(wildcard data/spirv/*.input)) \
	$(patsubst %.frag,%.frag.spv,$(wildcard data/spirv/*.frag)) \
	$(patsubst %.vert,%.vert.spv,$(wildcard data/spirv/*.vert))

dbg = -g
opt = -O0
inc = -Iframework
def = -DVKDF_PLATFORM_SDL -DVKDF_DATA_DIR=\"$(shell pwd)/data/\"

config = framework/config.h
ifeq ($(wildcard $(config)),)
$(file >$(config),$^)
endif

unused = -Wno-unused-function -Wno-unused-parameter -Wno-unused-variable

CXX = g++
CXXFLAGS = -Wall $(unused) $(dbg) $(opt) $(inc) $(def) \
	-Wextra `pkg-config --cflags glm glib-2.0 sdl2` -fPIC
LDFLAGS = -lvulkan -lassimp -lSDL2_image \
		`pkg-config --libs glm glib-2.0 sdl2`

GLSLANG = glslangValidator
FIXUP_GLSL := python $(shell pwd)/scripts/fixup-glsl.py

$(lib_so): $(obj) $(spv)
	$(CXX) -o $@ -shared $(obj) $(LDFLAGS)

%.frag: %.frag.input
	cd $(dir $<) && $(FIXUP_GLSL) $(notdir $<) $(notdir $@)

%.vert: %.vert.input
	cd $(dir $<) && $(FIXUP_GLSL) $(notdir $<) $(notdir $@)

%.vert.spv: %.vert
	$(GLSLANG) -V $< -o $@

%.frag.spv: %.frag
	$(GLSLANG) -V $< -o $@

-include $(dep)

# to create dependency files to rebuild when the included .h are modified
%.d: %.cpp
	@echo "Generating depfile: $@"
	@$(CPP) $(CXXFLAGS) $< -MM -MT $(@:.d=.o) >$@

.PHONY: clean
clean:
	rm -f $(obj) $(lib_so) $(dep) $(spv) $(config)

.PHONY: sponza
sponza:
	$(MAKE) -f MakefileSimple -C demos/sponza

In VKDF_HOME:
make -f MakefileSimple builds vkdf and shaders and generates config.h
make -f MakefileSimple sponza builds sponza