Update build instructions to include dependency on avr-libc.HEADmaster

Thanks to Rob Austein.

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index a36367d..f4a9385 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ To build a .hex file suitible for uploading to a board with a
 ATTiny828, a C compiler for AVR is needed, as wells a objcopy. On a
 Debian system, the following command can be used for installing both:
 
-    apt-get install gcc-avr binutils-avr
+    apt-get install gcc-avr binutils-avr avr-libc
 
 To build tamper.hex, type 'make' in this directory.