diff --git a/dinghy-lib/src/config.rs b/dinghy-lib/src/config.rs
index 5820aae..c348a32 100644
--- a/dinghy-lib/src/config.rs
+++ b/dinghy-lib/src/config.rs
@@ -118,14 +118,27 @@ impl PlatformConfiguration {
     }
 
     pub fn env(&self) -> Vec<(String, String)> {
-        self.env
-            .as_ref()
-            .map(|it| {
-                it.iter()
-                    .map(|(key, value)| (key.to_string(), value.to_string()))
-                    .collect_vec()
-            })
-            .unwrap_or(vec![])
+        let Some(env) = self.env.as_ref() else {
+            return vec![];
+        };
+
+        if let Some(sysroot) = self.sysroot.as_ref() {
+            let mut env = env.clone();
+            for flag in ["CFLAGS", "CPPFLAGS", "CXXFLAGS", "LDFLAGS"] {
+                let sr_argument = format!("--sysroot={sysroot}");
+                env.entry(flag.to_string())
+                    .and_modify(|value| {
+                        value.push(' ');
+                        value.push_str(&sr_argument);
+                    })
+                    .or_insert(sr_argument);
+            }
+            env.into_iter().collect_vec()
+        } else {
+            env.iter()
+                .map(|(key, value)| (key.to_string(), value.to_string()))
+                .collect()
+        }
     }
 }