diff --git a/sys/build.rs b/sys/build.rs
index f1d2b57..9ed5116 100644
--- a/sys/build.rs
+++ b/sys/build.rs
@@ -294,7 +294,6 @@ fn build() -> io::Result<()> {
     enable!(configure, "BUILD_LIB_XVID", "libxvid");
     enable!(configure, "BUILD_LIB_DRM", "libdrm");
     // other external libraries
-    enable!(configure, "BUILD_LIB_DRM", "libdrm");
     enable!(configure, "BUILD_NVENC", "nvenc");
 
     // configure external protocols