Changed the Makefile structure and tested if libtar is found.

Makefile

@@ -1,10 +0,0 @@
-SHELL=/usr/bin/env bash
-
-CORE_LIB_DIR=lib
-CORE_SRC_DIR=src
-
-# Build core steps
-build_core: build_core_lib build_core_src
-
-include $(CORE_DIR)/$(CORE_LIB_DIR)/Makefile
-include $(CORE_DIR)/$(CORE_SRC_DIR)/Makefile

src/Makefile

@@ -9,18 +9,18 @@ CORE_SOURCES := \
 
 # Compiler and flags
 CORE_CC = gcc
-CORE_CFLAGS = -Wall -Wextra -std=c17 -fPIC -g -DASSET_FILE=$(ASSET_OUTPUT)
-CORE_INCLUDE_DIRS = $(CORE_DIR)/$(CORE_SRC_DIR)/headers
+CORE_CFLAGS = -Wall -Wextra -std=c17 -fPIC -g -DASSET_FILENAME=$(ASSET_OUTPUT)
+CORE_INCLUDE_DIRS = $(CORE_DIR)/headers
 CORE_LDFLAGS = $(shell sdl2-config --cflags --libs) -lSDL2_image
 
 # Deduce objects
-CORE_OBJECTS = $(CORE_SOURCES:%.c=$(BUILD_DIR)/$(CORE_DIR)/$(CORE_SRC_DIR)/%.o)
+CORE_OBJECTS = $(CORE_SOURCES:%.c=$(BUILD_DIR)/$(CORE_DIR)/%.o)
 
 # Current file nb to process
 CURRENT_CORE_FILE := 0
 
 # Build core target
-build_core_src: core_setup count_core_build $(BUILD_DIR)/libCore.so core_end
+build_core: core_setup count_core_build $(BUILD_DIR)/libCore.so core_end
 
 # Core build directories
 core_setup:

src/asset_manager.c

@@ -1,6 +1,10 @@
 #include "asset_manager.h"
 
 #include <SDL2/SDL.h>
+#include <libtar.h>
 #include "display.h"
-#include "linked_list.h"
+
+#ifndef ASSET_FILENAME
+    #define ASSET_FILENAME "game.data"
+#endif