update readme

diff --git a/README.md b/README.md
index f896c0c095337325fa5622455c5dabc4e270bb3f..3d32d196b8fa8d0a26872eda04257b7f921c39aa 100644 (file)
--- a/README.md
+++ b/README.md
@@ -9,11 +9,14 @@ Unit tests for RISC-V processors
 Building from repository
 -----------------------------
 
+We assume that the RISCV environment variable is set to the RISC-V tools
+install path, and that the riscv-gcc package is installed.
+
     $ git clone https://github.com/ucb-bar/riscv-tests
     $ cd riscv-tests
     $ git submodule update --init --recursive
     $ autoconf
-    $ ./configure --prefix=/usr/local
+    $ ./configure --prefix=$RISCV/target
     $ make
     $ make install