Allow to build without manpage

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 This project follows [semantic versioning](http://semver.org).
 
+### UNRELEASED
+
+- [changed] Allow to build binary without manpage
+
 ### v0.9.1 (2019-02-16)
 
 - [fixed] Fixed bug in new hex secret key functionality

build.rs

@@ -13,13 +13,20 @@ fn main() {
     let out_dir = env::var("OUT_DIR").unwrap();
 
     // Compile tun/tap C code
-    println!("rerun-if-changed=src/c/tuntap.c");
+    println!("cargo:rerun-if-changed=src/c/tuntap.c");
     cc::Build::new().file("src/c/tuntap.c").include("src").compile("libtuntap.a");
 
     // Process manpage using ronn command
-    println!("rerun-if-changed=vpncloud.md");
+    println!("cargo:rerun-if-changed=vpncloud.md");
     fs::copy("vpncloud.md", Path::new(&out_dir).join("vpncloud.1.ronn")).unwrap();
-    Command::new("ronn").args(&["-r", "vpncloud.1.ronn"]).current_dir(&Path::new(&out_dir)).status().expect("Failed to process manpage, ronn command missing?");
+    match Command::new("ronn").args(&["-r", "vpncloud.1.ronn"]).current_dir(&Path::new(&out_dir)).status() {
+        Ok(_) => {
             Command::new("gzip").args(&["vpncloud.1"]).current_dir(&Path::new(&out_dir)).status().unwrap();
             fs::copy(Path::new(&out_dir).join("vpncloud.1.gz"), "target/vpncloud.1.gz").unwrap();
+        }, 
+        Err(err) => {
+            println!("cargo:warning=Error building manpage: {}", err);
+            println!("cargo:warning=The manpage will not be build. Do you have 'ronn'?");
+        }
+    }
 }