From 601a87d513db64080dd7803622f43316ab8aa2d0 Mon Sep 17 00:00:00 2001
From: Jay Jackson <jj@jj.is-a.dev>
Date: Tue, 17 May 2022 21:35:05 -0400
Subject: [PATCH] add use-vendored-config feature

---
 lvgl-sys/Cargo.toml |  3 +++
 lvgl-sys/build.rs   | 14 ++++++++++----
 lvgl/Cargo.toml     |  1 +
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/lvgl-sys/Cargo.toml b/lvgl-sys/Cargo.toml
index 46b07b2..d59a3bc 100644
--- a/lvgl-sys/Cargo.toml
+++ b/lvgl-sys/Cargo.toml
@@ -22,3 +22,6 @@ cty = "0.2.1"
 [build-dependencies]
 cc = "1.0.68"
 bindgen = "0.59.2"
+
+[features]
+use-vendored-config = []
diff --git a/lvgl-sys/build.rs b/lvgl-sys/build.rs
index dfaef3c..c427ed1 100644
--- a/lvgl-sys/build.rs
+++ b/lvgl-sys/build.rs
@@ -19,10 +19,16 @@ fn main() {
                         // so let's use the vendored `lv_conf.h` file.
                         vendor.join("include")
                     }
-                    Err(_) => panic!(
-                        "The environment variable {} is required to be defined",
-                        CONFIG_NAME
-                    ),
+                    Err(_) => {
+                        #[cfg(not(feature = "use-vendored-config"))]
+                        panic!(
+                            "The environment variable {} is required to be defined",
+                            CONFIG_NAME
+                        );
+
+                        #[cfg(feature = "use-vendored-config")]
+                        vendor.join("include")
+                    }
                 }
             });
 
diff --git a/lvgl/Cargo.toml b/lvgl/Cargo.toml
index 3ad7700..72acd96 100644
--- a/lvgl/Cargo.toml
+++ b/lvgl/Cargo.toml
@@ -21,6 +21,7 @@ bitflags = "1.2.1"
 [features]
 alloc = ["cstr_core/alloc"]
 lvgl_alloc = ["alloc"]
+use-vendored-config = ["lvgl-sys/use-vendored-config"]
 
 [build-dependencies]
 quote = "1.0.9"