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diff --git a/README b/README
index 0b9fd66788..8630f7d25b 100644
--- a/README
+++ b/README
@@ -17,6 +17,7 @@ Also read the man page to learn how to use MPlayer.
 
 
 Requirements:
+- You have to install libc6 (glibc) development packages or kernel headers.
 - To compile MPlayer with X11 support, you need to have the XFree86 development
   packages installed.
 - For the GUI you need the libpng and GTK 1.2 development packages.