diff --git a/mx_convert/mx_convert.py b/mx_convert/mx_convert.py
index ca3363b..59f9afd 100644
--- a/mx_convert/mx_convert.py
+++ b/mx_convert/mx_convert.py
@@ -25,7 +25,7 @@ HEADER_EXTS = [
 CMAKE_EXCLUDE_SOURCES = [
 	"*_template.c"
 ]
-CMAKE_TARGET = "" # Set from argv
+CMAKE_TARGET = "" # Set from config
 ASSUME_YES = False
 
 
@@ -80,15 +80,35 @@ def recurse_cmakelists(path: Path):
 		lines.append(")")
 	lines += ["add_subdirectory(%s)"%(directory.name) for directory in dirs]
 
-	# Write CMakeLists
-	lists_path = path / "CMakeLists.txt"
-	with open(lists_path, "w") as of:
-		of.write("\n".join(lines)+"\n")
+	# Write CMakeLists if not empty
+	if len(lines) != 0:
+		lists_path = path / "CMakeLists.txt"
+		with open(lists_path, "w") as of:
+			of.write("\n".join(lines)+"\n")
 
 	# Recurse
 	for directory in dirs:
 		recurse_cmakelists(directory)
 
+def root_cmakelists(path: Path):
+	lines: list[str] = []
+	lists_path = path / "CMakeLists.txt"
+
+	# Define custom libraries
+	lines.append("add_library(%s STATIC)"%(CMAKE_TARGET))
+	lines.append("target_compile_definitions(%s PRIVATE ${COMPILER_DEFINES})"%(CMAKE_TARGET))
+	lines.append("target_compile_options(${EXECUTABLE} PRIVATE \"-Os -ffunction-sections -fdata-sections -g -lto\")")
+	lines.append("target_link_options(${EXECUTABLE} PRIVATE \"-T ${LINKER_SCRIPT} --specs=nano.specs -Wl,--gc-sections\")")
+
+	# Read previously generated contents
+	with open(lists_path, "r") as _if:
+		lines = _if.readlines()
+	
+	# Save final result
+	with open(lists_path, "w") as of:
+		of.write("\n".join(lines)+"\n")
+	pass
+
 def load_config(path: Path):
 	if not path.exists():
 		return
@@ -162,6 +182,7 @@ def main2(ns: Namespace):
 
 	mx_cleanup(ns.path)
 	recurse_cmakelists(ns.path)
+	root_cmakelists(ns.path)
 
 def main():
 	parser = ArgumentParser(prog="MX Convert")
@@ -169,7 +190,7 @@ def main():
 	parser.add_argument("-d", "--discard", action="append", help="Add a file to the discard list (delete if found).")
 	parser.add_argument("-H", "--header", action="append", help="Add a pattern to the headers list, single wildcards allowed. Includes *.h by default.")
 	parser.add_argument("-s", "--source", action="append", help="Add a pattern to the sources list, single wildcards allowed. Includes *.c and *.s by default.")
-	parser.add_argument("-t", "--target", action="store", default="${EXECUTABLE}", help="The CMake target to generate references to. Defaults to '${EXECUTABLE}'.")
+	parser.add_argument("-t", "--target", action="store", default="cubemx", help="The CMake target to generate references to. Defaults to 'cubemx'.")
 	parser.add_argument("-x", "--exclude", action="append", help="Add a file to the source exclusion list, single wildcards allowed.")
 	parser.add_argument("-y", "--assume-yes", action="store_true", help="Assume yes on all queries, useful for scripts.")
 	parser.add_argument("--show-cfg", action="store_true", help="Show configs that would be used to run and exit successfully.")