Better dependencies in Makefile

Makefile

@@ -27,7 +27,7 @@ build_lib: build_deps
 	cd lib && OPTZ="${O2} -ggdb" CC=${CC} CXX=${CXX} ${MAKE}
 
 .PHONY: build_src
-build_src: build_deps
+build_src: build_deps build_lib
 	cd src && OPTZ="${O2} -ggdb" CC=${CC} CXX=${CXX} ${MAKE}
 
 .PHONY: build_deps_debug
@@ -35,11 +35,11 @@ build_deps_debug:
 	cd deps && OPTZ="${O0} -ggdb -DDEBUG" CC=${CC} CXX=${CXX} ${MAKE}
 
 .PHONY: build_lib_debug
-build_lib_debug:
+build_lib_debug: build_deps_debug
 	cd lib && OPTZ="${O0} -ggdb -DDEBUG" CC=${CC} CXX=${CXX} ${MAKE}
 
 .PHONY: build_src_debug
-build_src_debug:
+build_src_debug: build_deps build_lib_debug
 	cd src && OPTZ="${O0} -ggdb -DDEBUG" CC=${CC} CXX=${CXX} ${MAKE}
 
 .PHONY: clean