Add project-local dependencies installation

Makefile

@@ -11,6 +11,7 @@ CSC_FLAGS += -K prefix -static
 #    "during expansion of (import ...) - cannot import from undefined module: sex-macros"
 #     error.
 # -c: Stop after compilation to object files. This one is obvious.
+CHICKEN_INSTALL = chicken-install
 
 MODULE_FLAGS = -emit-all-import-libraries -module-registration -c
 
@@ -18,6 +19,18 @@ MODULE_FLAGS = -emit-all-import-libraries -module-registration -c
 MODULES = utils types sex-macros reader sex-modules semen sex-fmt-c fmt-c-writer sexc
 OBJ = $(MODULES:%=%.o)
 
+DEPSFILE = dependencies.txt
+DEPSLOCK = .eggs.lock
+
+DEPENDENCIES = $(shell cat $(DEPSFILE))
+CHICKEN_EXTERNAL_REPOSITORY := $(shell chicken-install -repository)
+
+export CHICKEN_EGG_CACHE=$(abspath .eggs)/cache
+export CHICKEN_REPOSITORY_PATH=$(abspath .eggs):$(CHICKEN_EXTERNAL_REPOSITORY)
+export CHICKEN_INSTALL_REPOSITORY=$(abspath .eggs)
+
+all: sexc
+
 sexc: $(OBJ) main.scm
 	$(CHICKEN_C) $(CSC_FLAGS) main.scm -o sexc-tmp -link sexc
         # otherwise csc hangs, probably because it tries to compile to sexc.o first
@@ -74,6 +87,16 @@ check-exit-code: sexc
 run-tests: sexc sex-tests sextest
 	./sex-tests && ./sextest --sexc=./sexc $(SEX_TEST_PROGRAMS:%=./tests/sex-programs/%.sex) && $(MAKE) check-modules && $(MAKE) check-exit-code
 
+run-tests: sex-tests
+	./sex-tests
+
+.eggs.lock: $(DEPSFILE)
+	env | grep CHICKEN
+	$(CHICKEN_INSTALL) $(DEPENDENCIES)
+	touch $(DEPSLOCK)
+
+deps: $(DEPSLOCK)
+
 clean:
 	rm -f $(OBJ) main.o
 	rm -f *.import.scm
@@ -81,4 +104,4 @@ clean:
 	rm -f sexc sex-tests sextest
 	$(MAKE) -C ./tests/modules clean
 
-.PHONY: clean run-tests sex-tests sextest check-modules check-exit-code
+.PHONY: clean depclean deps run-tests sex-tests sextest check-modules check-exit-code