diff --git a/tools/makectx_m2c.py b/tools/makectx_m2c.py
new file mode 100644
index 0000000..38360e7
--- /dev/null
+++ b/tools/makectx_m2c.py
@@ -0,0 +1,110 @@
+"""
+Creates a context of all headers with the preprocessor ran
+"""
+
+from argparse import ArgumentParser
+import os
+import subprocess
+import sys
+from tempfile import NamedTemporaryFile
+from typing import List, Optional
+
+
+INCLUDES = [
+    os.path.join("spm-headers", "include"),
+    os.path.join("spm-headers", "decomp"),
+    # include_cpp omitted for m2c compatability
+]
+CC = os.path.join("build", "compilers", "GC", "3.0a5.2", "mwcceppc")
+DEFINES = [
+    "DECOMP",
+    "SPM_EU0"
+]
+
+
+def check_wine(command: str, wine_override: Optional[str] = None) -> str:
+    if wine_override is None:
+        wine_override = "wine"
+    
+    if sys.platform != "win32":
+        return f"{wine_override} {command}"
+    else:
+        return command
+
+
+def get_cmd_stdout(cmd: str, text=True) -> str:
+    """Run a command and get the stdout output as a string"""
+
+    ret = subprocess.run(cmd.split(), stdout=subprocess.PIPE, text=text)
+    assert ret.returncode == 0, f"Command '{cmd}' returned {ret.returncode}"
+    return ret.stdout
+
+
+def find_headers(dirname: str, base=None) -> List[str]:
+    """Returns a list of all headers in a folder recursively"""
+
+    if base is None:
+        base = dirname
+
+    ret = []
+    for name in os.listdir(dirname):
+        path = dirname + '/' + name
+        if os.path.isdir(path):
+            ret.extend(find_headers(path, base))
+        elif name.endswith('.h'):
+            ret.append(path[len(base)+1:])
+
+    return ret
+
+
+def make_includes(dirnames: List[str]) -> str:
+    """Returns a chain of #includes for all headers in a folder"""
+
+    return '\n'.join(
+        '\n'.join(
+            f"#include <{header}>"
+            for header in find_headers(dirname)
+        )
+        for dirname in dirnames
+    )
+
+
+def preprocess(cc: str, includes: str, defines: List[str]) -> str:
+    """Gets the preprocessed text of a C file"""
+
+    defines_str = ' '.join(f"-d {define}" for define in defines)
+    includes_str = ' '.join(f"-i {include}" for include in INCLUDES)
+
+    # Run mwcc preprocessor
+    with NamedTemporaryFile(suffix=".c", delete=False) as tmp:
+        try:
+            tmp.write(includes.encode())
+            tmp.close()
+
+            # NOTE: not preprocessed in C++ mode
+            return get_cmd_stdout(
+                f"{cc} -I- {includes_str} {defines_str} -d M2C -stderr -E {tmp.name}"
+            )
+        finally:
+            os.unlink(tmp.name)
+
+
+if __name__ == "__main__":
+    parser = ArgumentParser()
+    parser.add_argument("-d", "--defines", type=str, nargs='+', default=DEFINES,
+                        help="Preprocessor defines")
+    parser.add_argument("-w", "--wine", type=str, help="Wine override (ignored on Windows)")
+    parser.add_argument("-o", "--out", type=str, help="Output file path")
+    args = parser.parse_args()
+
+    # Get cc command
+    cc = check_wine(CC, args.wine)
+
+    # Find all headers
+    includes = make_includes(INCLUDES)
+
+    # Preprocess headers
+    out = preprocess(cc, includes, args.defines)
+
+    # Output
+    print(out)