diff --git a/checkout_build_install_llvm.sh b/checkout_build_install_llvm.sh
index 19f26b2..721d45c 100755
--- a/checkout_build_install_llvm.sh
+++ b/checkout_build_install_llvm.sh
@@ -28,11 +28,11 @@ WORK_DIR=$PWD
 mkdir -p $WORK_DIR/src
 
 # Checkout
-cd $WORK_DIR/src && git clone --depth 1 http://llvm.org/git/llvm.git
-cd $WORK_DIR/src/llvm/tools && git clone --depth 1 http://llvm.org/git/clang.git
-cd $WORK_DIR/src/llvm/projects && git clone --depth 1 http://llvm.org/git/compiler-rt.git
-cd $WORK_DIR/src/llvm/projects && git clone --depth 1 http://llvm.org/git/libcxx.git
-cd $WORK_DIR/src/llvm/projects && git clone --depth 1 http://llvm.org/git/libcxxabi.git
+cd $WORK_DIR/src && git clone --depth 1 https://github.com/llvm-mirror/llvm.git
+cd $WORK_DIR/src/llvm/tools && git clone --depth 1 https://github.com/llvm-mirror/clang.git
+cd $WORK_DIR/src/llvm/projects && git clone --depth 1 https://github.com/llvm-mirror/compiler-rt.git
+cd $WORK_DIR/src/llvm/projects && git clone --depth 1 https://github.com/llvm-mirror/libcxx.git
+cd $WORK_DIR/src/llvm/projects && git clone --depth 1 https://github.com/llvm-mirror/libcxxabi.git
 
 # Uncomment if you want *fresh* libFuzzer from checkouted repository.
 #rm -r $WORK_DIR/libFuzzer/Fuzzer
@@ -52,4 +52,5 @@ ninja -j$(nproc)
 sudo ninja install
 rm -rf $WORK_DIR/work/llvm
 
-
+cd $WORK_DIR/libFuzzer/Fuzzer
+./build.sh
diff --git a/lessons/04/README.md b/lessons/04/README.md
index d9411d2..e0c3f20 100644
--- a/lessons/04/README.md
+++ b/lessons/04/README.md
@@ -34,7 +34,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
 Compile the fuzzer in the following way:
 ```bash
-clang++ -g -std=c++11 -fsanitize=address -fsanitize-coverage=trace-pc-guard \
+clang++ -g -std=c++11 -fsanitize=fuzzer,address \
     first_fuzzer.cc ../../libFuzzer/libFuzzer.a \
     -o first_fuzzer
 ```