diff --git a/src/main.rs b/src/main.rs
index 0b41e5c..2158bfc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -153,7 +153,7 @@ impl Makefile {
             panic!("error: makefile contains one mgen guard but not the other. cannot continue.");
         }
 
-        if ! contains_start && contains_end {
+        if !(contains_start && contains_end) {
             let include_dirs = Makefile::get_include_dirs(&contents);
             return Makefile { path: String::from(path), prologue: contents,
                 mgen_zone: String::from(""), epilogue: String::from(""), include_dirs };
@@ -176,11 +176,14 @@ impl Makefile {
     }
     
     fn get_include_dirs(search: &String) -> Vec<String> {
+        let mut include_dirs: Vec<String> = Vec::new();
+
         let makefile_regex = Regex::new(r"^INCS\s*=\s*(.*?)$").unwrap();
         let caps = makefile_regex.captures_iter(search);
-        let (_, [dirlist]) = caps.map(|c| c.extract()).last().unwrap();
-
-        let mut include_dirs: Vec<String> = Vec::new();
+        let dirlist = match caps.map(|c| c.extract()).last() {
+            Some((_, [v])) => v,
+            None => return include_dirs,
+        };
 
         let incdir_regex = Regex::new(r"-s*-I\s*(.*?)\s*").unwrap();
         let caps = incdir_regex.captures_iter(&dirlist);