diff --git a/configure.py b/configure.py
index 5ecb9ac..6f478dd 100755
--- a/configure.py
+++ b/configure.py
@@ -16,7 +16,15 @@ import argparse
 import sys
 from pathlib import Path
 from typing import Any, Dict, List
-from tools.project import *
+
+from tools.project import (
+    Object,
+    ProgressCategory,
+    ProjectConfig,
+    calculate_progress,
+    generate_build,
+    is_windows,
+)
 
 # Game versions
 DEFAULT_VERSION = 0
diff --git a/tools/project.py b/tools/project.py
index c45f93e..d085c3b 100644
--- a/tools/project.py
+++ b/tools/project.py
@@ -213,11 +213,13 @@ CHAIN = "cmd /c " if is_windows() else ""
 EXE = ".exe" if is_windows() else ""
 
 
-def make_flags_str(cflags: Union[str, List[str]]) -> str:
-    if isinstance(cflags, list):
-        return " ".join(cflags)
+def make_flags_str(flags: Optional[Union[str, List[str]]]) -> str:
+    if flags is None:
+        return ""
+    elif isinstance(flags, list):
+        return " ".join(flags)
     else:
-        return cflags
+        return flags
 
 
 # Load decomp-toolkit generated config.json
@@ -282,7 +284,7 @@ def generate_build_ninja(
     # Variables
     ###
     n.comment("Variables")
-    n.variable("ldflags", " ".join(config.ldflags or []))
+    n.variable("ldflags", make_flags_str(config.ldflags))
     if config.linker_version is None:
         sys.exit("ProjectConfig.linker_version missing")
     n.variable("mw_version", Path(config.linker_version))