README: account for funky xcode paths

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/README.md b/README.md
index 953ea63fb561360e53783076820127b2d646b50f..2f09231ce749a14da0d552f38f7454c261bef1a1 100644 (file)
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ $ open WireGuard.xcodeproj
      the "External Build Tool Configuration":
      
      ```
-     $BUILD_DIR/../../SourcePackages/checkouts/wireguard-apple/Sources/WireGuardKitGo
+     ${BUILD_DIR%Build/*}SourcePackages/checkouts/wireguard-apple/Sources/WireGuardKitGo
      ```
      
    - Switch to "Build Settings" and find `SDKROOT`.