diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 03470fd19..d3f8043a5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,11 +22,8 @@ jobs:
 
     - uses: actions/setup-python@v2
 
-    - name: Make header
-      run: python ./scripts/MakeSingleHeader.py CLI11.hpp
-
     - name: Prepare CMake config
-      run: cmake -S . -B build
+      run: cmake -S . -B build -DCLI11_SINGLE_FILE=ON
 
     - name: Make package
       run: cmake --build build --target package_source
@@ -37,10 +34,13 @@ jobs:
         cp build/CLI11-*-Source.* CLI11-Source
         cp build/CLI11-*-Source.* .
 
+    - name: Make header
+      run: cmake --build build --target CLI11-generate-single-file
+
     - uses: actions/upload-artifact@v2
       with:
         name: CLI11.hpp
-        path: CLI11.hpp
+        path: build/include/CLI11.hpp
 
     - uses: actions/upload-artifact@v2
       with:
diff --git a/CLI11.hpp.in b/CLI11.hpp.in
new file mode 100644
index 000000000..8de9c532e
--- /dev/null
+++ b/CLI11.hpp.in
@@ -0,0 +1,67 @@
+// CLI11: Version {version}
+// Originally designed by Henry Schreiner
+// https://github.com/CLIUtils/CLI11
+//
+// This is a standalone header file generated by MakeSingleHeader.py in CLI11/scripts
+// from: {git}
+//
+// CLI11 {version} Copyright (c) 2017-2020 University of Cincinnati, developed by Henry
+// Schreiner under NSF AWARD 1414736. All rights reserved.
+//
+// Redistribution and use in source and binary forms of CLI11, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this
+//    list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation
+//    and/or other materials provided with the distribution.
+// 3. Neither the name of the copyright holder nor the names of its contributors
+//    may be used to endorse or promote products derived from this software without
+//    specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Standard combined includes:
+{public_includes}
+
+{version_hpp}
+
+{macros_hpp}
+
+{validators_hpp_filesystem}
+
+namespace {namespace} {{
+
+{string_tools_hpp}
+
+{error_hpp}
+
+{type_tools_hpp}
+
+{split_hpp}
+
+{config_fwd_hpp}
+
+{validators_hpp}
+
+{formatter_fwd_hpp}
+
+{option_hpp}
+
+{app_hpp}
+
+{config_hpp}
+
+{formatter_hpp}
+
+}} // namespace {namespace}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f3df27444..ee0228ee5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -247,7 +247,10 @@ if(CLI11_SINGLE_FILE)
     add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp"
         COMMAND Python::Interpreter
         "${CMAKE_CURRENT_SOURCE_DIR}/scripts/MakeSingleHeader.py"
-        "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp"
+        ${CLI11_headers}
+        --main "${CMAKE_CURRENT_SOURCE_DIR}/CLI11.hpp.in"
+        --output "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp"
+        --version "${CLI11_VERSION}"
         DEPENDS
         "${CMAKE_CURRENT_SOURCE_DIR}/include/CLI/CLI.hpp"
         ${CLI11_headers})
diff --git a/include/CLI/App.hpp b/include/CLI/App.hpp
index 53bb8fae8..d3c513bd0 100644
--- a/include/CLI/App.hpp
+++ b/include/CLI/App.hpp
@@ -6,6 +6,7 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <algorithm>
 #include <cstdint>
 #include <functional>
@@ -18,6 +19,7 @@
 #include <string>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
 
 // CLI Library includes
 #include "ConfigFwd.hpp"
@@ -30,6 +32,7 @@
 #include "TypeTools.hpp"
 
 namespace CLI {
+// [CLI11:app_hpp:verbatim]
 
 #ifndef CLI11_PARSE
 #define CLI11_PARSE(app, argc, argv)                                                                                   \
@@ -3234,4 +3237,5 @@ struct AppFriend {
 };
 }  // namespace detail
 
+// [CLI11:app_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Config.hpp b/include/CLI/Config.hpp
index 0f6a05a7f..725872dca 100644
--- a/include/CLI/Config.hpp
+++ b/include/CLI/Config.hpp
@@ -6,19 +6,21 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <algorithm>
 #include <fstream>
 #include <iostream>
 #include <string>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:set]
 
 #include "App.hpp"
 #include "ConfigFwd.hpp"
 #include "StringTools.hpp"
 
 namespace CLI {
-
+// [CLI11:config_hpp:verbatim]
 namespace detail {
 
 inline std::string convert_arg_for_ini(const std::string &arg) {
@@ -348,4 +350,5 @@ ConfigBase::to_config(const App *app, bool default_also, bool write_description,
     return out.str();
 }
 
+// [CLI11:config_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/ConfigFwd.hpp b/include/CLI/ConfigFwd.hpp
index 2546d1352..2d9f9a39c 100644
--- a/include/CLI/ConfigFwd.hpp
+++ b/include/CLI/ConfigFwd.hpp
@@ -6,16 +6,19 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <algorithm>
 #include <fstream>
 #include <iostream>
 #include <string>
 #include <vector>
+// [CLI11:public_includes:end]
 
 #include "Error.hpp"
 #include "StringTools.hpp"
 
 namespace CLI {
+// [CLI11:config_fwd_hpp:verbatim]
 
 class App;
 
@@ -128,4 +131,5 @@ class ConfigINI : public ConfigTOML {
         valueDelimiter = '=';
     }
 };
+// [CLI11:config_fwd_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Error.hpp b/include/CLI/Error.hpp
index 6055cfba5..e6a832573 100644
--- a/include/CLI/Error.hpp
+++ b/include/CLI/Error.hpp
@@ -6,16 +6,19 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <exception>
 #include <stdexcept>
 #include <string>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
 
 // CLI library includes
 #include "StringTools.hpp"
 
 namespace CLI {
+// [CLI11:error_hpp:verbatim]
 
 // Use one of these on all error classes.
 // These are temporary and are undef'd at the end of this file.
@@ -344,4 +347,5 @@ class OptionNotFound : public Error {
 
 /// @}
 
+// [CLI11:error_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Formatter.hpp b/include/CLI/Formatter.hpp
index daae93153..cb9e92a57 100644
--- a/include/CLI/Formatter.hpp
+++ b/include/CLI/Formatter.hpp
@@ -6,14 +6,17 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <algorithm>
 #include <string>
 #include <vector>
+// [CLI11:public_includes:end]
 
 #include "App.hpp"
 #include "FormatterFwd.hpp"
 
 namespace CLI {
+// [CLI11:formatter_hpp:verbatim]
 
 inline std::string
 Formatter::make_group(std::string group, bool is_positional, std::vector<const Option *> opts) const {
@@ -285,4 +288,5 @@ inline std::string Formatter::make_option_usage(const Option *opt) const {
     return opt->get_required() ? out.str() : "[" + out.str() + "]";
 }
 
+// [CLI11:formatter_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/FormatterFwd.hpp b/include/CLI/FormatterFwd.hpp
index 362219e24..6908d4644 100644
--- a/include/CLI/FormatterFwd.hpp
+++ b/include/CLI/FormatterFwd.hpp
@@ -6,14 +6,17 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
 
 #include "StringTools.hpp"
 
 namespace CLI {
+// [CLI11:formatter_fwd_hpp:verbatim]
 
 class Option;
 class App;
@@ -177,4 +180,5 @@ class Formatter : public FormatterBase {
     ///@}
 };
 
+// [CLI11:formatter_fwd_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Macros.hpp b/include/CLI/Macros.hpp
index 44e7098a0..778fec7dc 100644
--- a/include/CLI/Macros.hpp
+++ b/include/CLI/Macros.hpp
@@ -6,7 +6,7 @@
 
 #pragma once
 
-// [CLI11:verbatim]
+// [CLI11:macros_hpp:verbatim]
 
 // The following version macro is very similar to the one in PyBind11
 #if !(defined(_MSC_VER) && __cplusplus == 199711L) && !defined(__INTEL_COMPILER)
@@ -41,4 +41,4 @@
 #define CLI11_DEPRECATED(reason) __attribute__((deprecated(reason)))
 #endif
 
-// [CLI11:verbatim]
+// [CLI11:macros_hpp:end]
diff --git a/include/CLI/Option.hpp b/include/CLI/Option.hpp
index fdf4b5ce7..f09f61f97 100644
--- a/include/CLI/Option.hpp
+++ b/include/CLI/Option.hpp
@@ -6,6 +6,7 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <algorithm>
 #include <functional>
 #include <memory>
@@ -14,6 +15,7 @@
 #include <tuple>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
 
 #include "Error.hpp"
 #include "Macros.hpp"
@@ -22,6 +24,7 @@
 #include "Validators.hpp"
 
 namespace CLI {
+// [CLI11:option_hpp:verbatim]
 
 using results_t = std::vector<std::string>;
 /// callback function definition
@@ -1316,4 +1319,5 @@ class Option : public OptionBase<Option> {
     }
 };  // namespace CLI
 
+// [CLI11:option_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Split.hpp b/include/CLI/Split.hpp
index 6306404bc..36c953de8 100644
--- a/include/CLI/Split.hpp
+++ b/include/CLI/Split.hpp
@@ -6,15 +6,19 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <string>
 #include <tuple>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
 
 #include "Error.hpp"
 #include "StringTools.hpp"
 
 namespace CLI {
+// [CLI11:split_hpp:verbatim]
+
 namespace detail {
 
 // Returns false if not a short option. Otherwise, sets opt name and rest and returns true
@@ -135,4 +139,5 @@ get_names(const std::vector<std::string> &input) {
 }
 
 }  // namespace detail
+// [CLI11:split_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/StringTools.hpp b/include/CLI/StringTools.hpp
index f098a3d8f..090445e5b 100644
--- a/include/CLI/StringTools.hpp
+++ b/include/CLI/StringTools.hpp
@@ -6,6 +6,7 @@
 
 #pragma once
 
+// [CLI11:public_includes:set]
 #include <algorithm>
 #include <iomanip>
 #include <locale>
@@ -14,9 +15,12 @@
 #include <string>
 #include <type_traits>
 #include <vector>
+// [CLI11:public_includes:end]
 
 namespace CLI {
 
+// [CLI11:string_tools_hpp:verbatim]
+
 /// Include the items in this namespace to get free conversion of enums to/from streams.
 /// (This is available inside CLI as well, so CLI11 will use this without a using statement).
 namespace enums {
@@ -409,4 +413,6 @@ inline std::string &add_quotes_if_needed(std::string &str) {
 
 }  // namespace detail
 
+// [CLI11:string_tools_hpp:end]
+
 }  // namespace CLI
diff --git a/include/CLI/TypeTools.hpp b/include/CLI/TypeTools.hpp
index 28a8e4026..be0e89ab6 100644
--- a/include/CLI/TypeTools.hpp
+++ b/include/CLI/TypeTools.hpp
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include "StringTools.hpp"
+// [CLI11:public_includes:set]
 #include <cstdint>
 #include <exception>
 #include <memory>
@@ -14,8 +14,12 @@
 #include <type_traits>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
+
+#include "StringTools.hpp"
 
 namespace CLI {
+// [CLI11:type_tools_hpp:verbatim]
 
 // Type tools
 
@@ -1540,4 +1544,5 @@ void sum_flag_vector(const std::vector<std::string> &flags, T &output) {
 #endif
 
 }  // namespace detail
+// [CLI11:type_tools_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Validators.hpp b/include/CLI/Validators.hpp
index 2c9983849..90b590f6b 100644
--- a/include/CLI/Validators.hpp
+++ b/include/CLI/Validators.hpp
@@ -10,6 +10,7 @@
 #include "StringTools.hpp"
 #include "TypeTools.hpp"
 
+// [CLI11:public_includes:set]
 #include <cmath>
 #include <cstdint>
 #include <functional>
@@ -20,8 +21,9 @@
 #include <string>
 #include <utility>
 #include <vector>
+// [CLI11:public_includes:end]
 
-// [CLI11:verbatim]
+// [CLI11:validators_hpp_filesystem:verbatim]
 
 // C standard library
 // Only needed for existence checking
@@ -55,9 +57,10 @@
 #include <sys/types.h>
 #endif
 
-// [CLI11:verbatim]
+// [CLI11:validators_hpp_filesystem:end]
 
 namespace CLI {
+// [CLI11:validators_hpp:verbatim]
 
 class Option;
 
@@ -1112,4 +1115,5 @@ inline std::pair<std::string, std::string> split_program_name(std::string comman
 }  // namespace detail
 /// @}
 
+// [CLI11:validators_hpp:end]
 }  // namespace CLI
diff --git a/include/CLI/Version.hpp b/include/CLI/Version.hpp
index 41b28e6c6..dde959890 100644
--- a/include/CLI/Version.hpp
+++ b/include/CLI/Version.hpp
@@ -6,11 +6,11 @@
 
 #pragma once
 
-// [CLI11:verbatim]
+// [CLI11:version_hpp:verbatim]
 
 #define CLI11_VERSION_MAJOR 1
 #define CLI11_VERSION_MINOR 9
 #define CLI11_VERSION_PATCH 1
 #define CLI11_VERSION "1.9.1"
 
-// [CLI11:verbatim]
+// [CLI11:version_hpp:end]
diff --git a/scripts/MakeSingleHeader.py b/scripts/MakeSingleHeader.py
index 1c4385826..78714ffb5 100755
--- a/scripts/MakeSingleHeader.py
+++ b/scripts/MakeSingleHeader.py
@@ -5,171 +5,136 @@
 import os
 import re
 from argparse import ArgumentParser
-from operator import add
-from copy import copy
-from functools import reduce
 from subprocess import Popen, PIPE
-
-includes_local = re.compile(r"""^#include "(.*)"$""", re.MULTILINE)
-includes_system = re.compile(r"""^#include \<(.*)\>$""", re.MULTILINE)
-version_finder = re.compile(r"""^#define CLI11_VERSION \"(.*)\"$""", re.MULTILINE)
-verbatim_tag_str = r"""
-^               # Begin of line
-[^\n^\[]+       # Some characters, not including [ or the end of a line
-\[              # A literal [
-[^\]^\n]*       # Anything except a closing ]
-CLI11:verbatim  # The tag
-[^\]^\n]*       # Anything except a closing ]
-\]              # A literal ]
-[^\n]*          # Up to end of line
-$               # End of a line
+import warnings
+
+tag_str = r"""
+^                  # Begin of line
+[/\s]+             # Whitespace or comment // chars
+\[                 # A literal [
+{tag}:             # The tag
+(?P<name>[\w_]+)   # name: group name
+:                  # Colon
+(?P<action>[\w_]+) # action: type of include
+\]                 # A literal ]
+\s*                # Whitespace
+$                  # End of a line
+
+(?P<content>.*)    # All
+
+^                  # Begin of line
+[/\s]+             # Whitespace or comment // chars
+\[                 # A literal [
+{tag}:             # The tag
+(?P=name)          # Repeated name
+:                  # Colon
+end                # Literal "end"
+\]                 # A literal ]
+\s*                # Whitespace
+$                  # End of a line
 """
-verbatim_all = re.compile(
-    verbatim_tag_str + "(.*)" + verbatim_tag_str, re.MULTILINE | re.DOTALL | re.VERBOSE
-)
 
 DIR = os.path.dirname(os.path.abspath(__file__))
 
 
-class HeaderFile(object):
-    TAG = "Unknown git revision"
-    LICENSE = "// BSD 3 clause"
-    VERSION = "Unknown"
+class HeaderGroups(dict):
+    def __init__(self, tag):
+        self.re_matcher = re.compile(
+            tag_str.format(tag=tag), re.MULTILINE | re.DOTALL | re.VERBOSE
+        )
+        super(HeaderGroups, self).__init__()
 
-    def __init__(self, base, inc):
-        with open(os.path.join(base, inc)) as f:
+    def read_header(self, filename):
+        with open(filename) as f:
             inner = f.read()
 
-        version = version_finder.search(inner)
-        if version:
-            self.__class__.VERSION = version.groups()[0]
-
-        # add self.verbatim
-        if "CLI11:verbatim" in inner:
-            self.verbatim = ["\n\n// Verbatim copy from {0}:".format(inc)]
-            self.verbatim += verbatim_all.findall(inner)
-            inner = verbatim_all.sub("", inner)
-        else:
-            self.verbatim = []
-
-        self.headers = set(includes_system.findall(inner))
-
-        self.body = "\n// From {0}:\n\n".format(inc) + inner[inner.find("namespace") :]
-
-        self.namespace = None
-
-    def __add__(self, other):
-        out = copy(self)
-        out.headers |= other.headers
-        out.body += other.body
-        out.verbatim += other.verbatim
-        return out
-
-    @property
-    def header_str(self):
-        return "\n".join("#include <" + h + ">" for h in sorted(self.headers))
-
-    @property
-    def verbatim_str(self):
-        return "\n".join(self.verbatim)
-
-    def insert_namespace(self, namespace):
-        self.namespace = namespace
-
-    def macro_replacement(self, before, after):
-        self.verbatim = [x.replace(before, after) for x in self.verbatim]
-        self.body = self.body.replace(before, after)
-
-    def __str__(self):
-        result = """\
-#pragma once
-
-// CLI11: Version {self.VERSION}
-// Originally designed by Henry Schreiner
-// https://github.com/CLIUtils/CLI11
-//
-// This is a standalone header file generated by MakeSingleHeader.py in CLI11/scripts
-// from: {self.TAG}
-//
-// From LICENSE:
-//
-{self.LICENSE}
-
-// Standard combined includes:
-
-{self.header_str}
-""".format(
-            self=self
-        )
+        matches = self.re_matcher.findall(inner)
+
+        if not matches:
+            warnings.warn(
+                "Failed to find any matches in {filename}".format(filename=filename)
+            )
 
-        if self.namespace:
-            result += "\nnamespace " + self.namespace + " {\n\n"
-        result += "{self.verbatim_str}\n{self.body}\n".format(self=self)
-        if self.namespace:
-            result += "} // namespace " + self.namespace + "\n\n"
+        for name, action, content in matches:
+            if action == "verbatim":
+                assert (
+                    name not in self
+                ), "{name} read in more than once! Quitting.".format(name=name)
+                self[name] = content
+            elif action == "set":
+                self[name] = self.get(name, set()) | set(content.strip().splitlines())
+            else:
+                raise RuntimeError("Action not understood, must be verbatim or set")
 
-        return result
+    def post_process(self):
+        for key in self:
+            if isinstance(self[key], set):
+                self[key] = "\n".join(self[key])
 
 
-def MakeHeader(
-    output, main_header, include_dir="../include", namespace=None, macro=None
-):
+def MakeHeader(output, main_header, files, tag, namespace, macro=None, version=None):
+    groups = HeaderGroups(tag)
+
     # Set tag if possible to class variable
     try:
         proc = Popen(
             ["git", "describe", "--tags", "--always"], cwd=str(DIR), stdout=PIPE
         )
         out, _ = proc.communicate()
+        groups["git"] = out.decode("utf-8").strip() if proc.returncode == 0 else ""
     except OSError:
-        pass
-    else:
-        if proc.returncode == 0:
-            HeaderFile.TAG = out.decode("utf-8").strip()
-
-    base_dir = os.path.abspath(os.path.join(DIR, include_dir))
-    main_header = os.path.join(base_dir, main_header)
-    header_dir = os.path.dirname(main_header)
-    licence_file = os.path.abspath(os.path.join(DIR, "../LICENSE"))
+        groups["git"] = ""
 
-    with open(licence_file) as f:
-        HeaderFile.LICENSE = "".join("// " + line for line in f)
+    for f in files:
+        groups.read_header(f)
 
-    with open(main_header) as f:
-        header = f.read()
+    groups["namespace"] = namespace
+    groups["version"] = version or groups["git"]
 
-    include_files = includes_local.findall(header)
+    groups.post_process()
 
-    headers = [HeaderFile(header_dir, inc) for inc in include_files]
-    single_header = reduce(add, headers)
+    with open(main_header) as f:
+        single_header = f.read().format(**groups)
 
     if macro is not None:
-        before = "CLI11_"
-        print("Converting macros", before, "->", macro)
-        single_header.macro_replacement(before, macro)
+        before, after = macro
+        print("Converting macros", before, "->", after)
+        single_header.replace(before, after)
 
-    if namespace:
-        print("Adding namespace", namespace)
-        single_header.insert_namespace(namespace)
+    if output is not None:
+        with open(output, "w") as f:
+            f.write(single_header)
 
-    with open(output, "w") as f:
-        f.write(str(single_header))
-
-    print("Created", output)
+        print("Created", output)
+    else:
+        print(single_header)
 
 
 if __name__ == "__main__":
     parser = ArgumentParser(
         usage="Convert source to single header include. Can optionally add namespace and search-replace replacements (for macros)."
     )
-    parser.add_argument("output", help="Single header file output")
+    parser.add_argument("--output", default=None, help="Single header file output")
     parser.add_argument(
         "--main",
-        default="CLI/CLI.hpp",
+        default="CLI11.hpp.in",
         help="The main include file that defines the other files",
     )
-    parser.add_argument("--include", default="../include", help="The include directory")
-    parser.add_argument("--namespace", help="Add an optional namespace")
-    parser.add_argument("--macro", help="Replaces CLI11_ with NEW_PREFIX_")
+    parser.add_argument("files", nargs="*", help="The header files")
+    parser.add_argument("--namespace", default="CLI", help="Set the namespace")
+    parser.add_argument("--tag", default="CLI11", help="Tag to look up")
+    parser.add_argument(
+        "--macro", nargs=2, help="Replaces OLD_PREFIX_ with NEW_PREFIX_"
+    )
+    parser.add_argument("--version", help="Include this version in the generated file")
     args = parser.parse_args()
 
-    MakeHeader(args.output, args.main, args.include, args.namespace, args.macro)
+    MakeHeader(
+        args.output,
+        args.main,
+        args.files,
+        args.tag,
+        args.namespace,
+        args.macro,
+        args.version,
+    )