diff --git a/Cargo.lock b/Cargo.lock
index c30f4ad..d3d2134 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,100 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anstream"
+version = "0.6.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d96bd03f33fe50a863e394ee9718a706f988b9079b20c3784fb726e7678b62fb"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c75ac65da39e5fe5ab759307499ddad880d724eed2f6ce5b5e8a26f4f387928c"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e28923312444cdd728e4738b3f9c9cac739500909bb3d3c94b43551b16517648"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cd54b81ec8d6180e24654d0b371ad22fc3dd083b6ff8ba325b72e00c87660a7"
+dependencies = [
+ "anstyle",
+ "windows-sys",
+]
+
+[[package]]
+name = "clap"
+version = "4.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c918d541ef2913577a0f9566e9ce27cb35b6df072075769e0b26cb5a554520da"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f3e7391dad68afb0c2ede1bf619f579a3dc9c2ec67f089baa397123a2f3d1eb"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "307bc0538d5f0f83b8248db3087aa92fe504e4691294d0c96c0eabc33f47ba47"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
+
+[[package]]
+name = "colorchoice"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -14,6 +108,12 @@ version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
 
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
 [[package]]
 name = "indexmap"
 version = "2.2.5"
@@ -34,6 +134,7 @@ checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
 name = "ngen"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "toml",
 ]
 
@@ -84,6 +185,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ee073c9e4cd00e28217186dbe12796d692868f432bf2e97ee73bed0c56dfa01"
+
 [[package]]
 name = "syn"
 version = "2.0.52"
@@ -135,6 +242,78 @@ version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
+[[package]]
+name = "utf8parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd37b7e5ab9018759f893a1952c9420d060016fc19a472b4bb20d1bdd694d1b"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcf46cf4c365c6f2d1cc93ce535f2c8b244591df96ceee75d8e83deb70a9cac9"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da9f259dd3bcf6990b55bffd094c4f7235817ba4ceebde8e6d11cd0c5633b675"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b474d8268f99e0995f25b9f095bc7434632601028cf86590aea5c8a5cb7801d3"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1515e9a29e5bed743cb4415a9ecf5dfca648ce85ee42e15873c3cd8610ff8e02"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5eee091590e89cc02ad514ffe3ead9eb6b660aedca2183455434b93546371a03"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ca79f2451b49fa9e2af39f0747fe999fcda4f5e241b2898624dca97a1f2177"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32b752e52a2da0ddfbdbcc6fceadfeede4c939ed16d13e648833a61dfb611ed8"
+
 [[package]]
 name = "winnow"
 version = "0.6.5"
diff --git a/Cargo.toml b/Cargo.toml
index dbc0109..745b6a8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,4 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.5.1", features = ["derive"] }
 toml = "0.8.10"
diff --git a/src/main.rs b/src/main.rs
index 0217f0a..be77f4b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,16 @@
+use clap::Parser;
 use std::fs::{read, write};
 use toml::{Table, Value};
 
+#[derive(Parser)]
+struct Args {
+    #[arg(short, long, default_value = "ngen.toml")]
+    config_file: String,
+
+    #[arg(short, long, default_value = "build.ninja")]
+    output_file: String,
+}
+
 fn print_tabs(num: usize) {
     for _ in 0..num {
         print!("  ");
@@ -71,7 +81,8 @@ fn target_generator(name: &str, config_table: &Table) -> String {
     };
 
     ret.push_str(&format!(
-        r#"# BEGIN TARGET {name}
+        "\
+# BEGIN TARGET {name}
 rule cc_{name}
   deps = gcc
   depfile = $dep
@@ -84,7 +95,7 @@ rule link_{name}
 build $builddir/{name}/obj: mkdir
 build $builddir/{name}/dep: mkdir
 
-"#
+"
     ));
     let sources = config_table
         .get("sources")
@@ -101,7 +112,7 @@ build $builddir/{name}/dep: mkdir
                         let obj_name = format!("$builddir/{name}/obj/{new_file}.o");
                         let dep_name = format!("$builddir/{name}/dep/{new_file}.o.d");
                         ret.push_str(&format!(
-                            "build {obj_name}: cc_{name} {s} | build.ninja || $builddir/{name}/obj $builddir/{name}/dep\n  dep = {dep_name}\n"
+                            "build {obj_name}: cc_{name} {s}\n  dep = {dep_name}\n"
                         ));
                         object_list.push(obj_name);
                     }
@@ -117,7 +128,7 @@ build $builddir/{name}/dep: mkdir
     ret.push_str(&format!("\nbuild $builddir/{name}/{outfile}: link_{name} "));
     ret.push_str(&object_list.join(" "));
     ret.push_str(&format!(
-        " \nbuild {name}: phony $builddir/{name}/{outfile}\n"
+        " || $builddir/{name}/obj $builddir/{name}/dep\nbuild {name}: phony $builddir/{name}/{outfile}\n"
     ));
     ret.push_str(&format!("# END TARGET {name}\n"));
 
@@ -125,15 +136,19 @@ build $builddir/{name}/dep: mkdir
 }
 
 fn main() {
-    let conf_file_name = "ngen.toml";
+    let args = Args::parse();
+    let output_file = &args.output_file;
+    let config_file_name = &args.config_file;
+
     let conf_file_bytes =
-        read(conf_file_name).unwrap_or_else(|e| panic!("fatal: could not read file: {e}"));
+        read(config_file_name).unwrap_or_else(|e| panic!("fatal: could not read file: {e}"));
     let conf_file = String::from_utf8_lossy(&conf_file_bytes);
     let conf = toml::from_str::<Table>(&conf_file)
         .unwrap_or_else(|e| panic!("fatal: could not parse config file: {e}"));
 
-    let mut ninjafile = String::from(&format!(
-        r#"# Generated by ngen. Do not modify by hand.
+    let mut ninjafile = String::from(
+        "\
+# Generated by ngen. Do not modify by hand.
 
 builddir = build
 
@@ -142,13 +157,15 @@ rule mkdir
   description = Creating directory $out
 
 rule regen
-  command = ngen -f $in
+  command = ngen -c $in -o $out
   generator = 1
-  description = Regenerating build.ninja
+  description = Regenerating $out
 
-build build.ninja: regen ngen.toml
-  pool = console
-"#,
+",
+    );
+
+    ninjafile.push_str(&format!(
+        "build {output_file}: regen {config_file_name}\n  pool = console\n"
     ));
 
     for k in conf.keys() {
@@ -167,6 +184,6 @@ build build.ninja: regen ngen.toml
         }
     }
 
-    write("build.ninja", ninjafile)
+    write(output_file, ninjafile)
         .unwrap_or_else(|e| panic!("fatal: could not write ninja file: {e}"));
 }