diff --git a/acatcher/README b/acatcher/README
index 0f5d57d..ec21da2 100644
--- a/acatcher/README
+++ b/acatcher/README
@@ -1,8 +1,8 @@
 
 host side:
 
-apt-get install libopencv-dev
-clang++ -O2 -lopencv_core -lopencv_highgui -lopencv_imgproc -o acatcher acatcher.cxx
+apt-get install libopencv-dev llvm-3.4 clang-3.4
+clang++-3.4 -O2 -lopencv_core -lopencv_highgui -lopencv_imgproc -o acatcher acatcher.cxx
 
 to actually run it:
 ./acatcher | (aplay -t raw -c 1 -f S16_LE -r 22050 > /dev/null 2> /dev/null)