diff --git a/README.md b/README.md
index 7a836a7..8749248 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ DeepState currently targets Linux, with macOS support in progress.
 Build:
 
 - CMake
-- GCC with multilib support
+- GCC and G++ with multilib support
 - Python 2.7
 - Setuptools
 
@@ -47,11 +47,11 @@ Runtime:
 ## Building on Ubuntu 16.04 (Xenial)
 
 ```shell
-$ sudo apt update && sudo apt-get install build-essential gcc-multilib cmake python python-setuptools libffi-dev
-$ git clone https://github.com/trailofbits/deepstate deepstate
-$ mkdir deepstate/build && cd deepstate/build
-$ cmake ../
-$ make
+sudo apt update && sudo apt-get install build-essential gcc-multilib g++-multilib cmake python python-setuptools libffi-dev z3
+git clone https://github.com/trailofbits/deepstate deepstate
+mkdir deepstate/build && cd deepstate/build
+cmake ../
+make
 ```
 
 ## Installing
@@ -59,9 +59,9 @@ $ make
 Assuming the DeepState build resides in `$DEEPSTATE`, run the following commands to install the DeepState python package:
 
 ```shell
-$ virtualenv venv
-$ . venv/bin/activate
-$ python $DEEPSTATE/build/setup.py install
+virtualenv venv
+. venv/bin/activate
+python $DEEPSTATE/build/setup.py install
 ```
 
 The `virtualenv`-enabled `$PATH` should now include two executables: `deepstate` and `deepstate-angr`. These are _executors_, which are used to run DeepState test binaries with specific backends (automatically installed as Python dependencies). The `deepstate` executor uses the Manticore backend while `deepstate-angr` uses angr. They share a common interface where you may specify a number of workers and an output directory for saving backend-generated test cases.
@@ -69,7 +69,7 @@ The `virtualenv`-enabled `$PATH` should now include two executables: `deepstate`
 You can check your build using the test binaries that were (by default) built and emitted to `deepstate/build/examples`. For example, to use angr to symbolically execute the `IntegerOverflow` test harness with 4 workers, saving generated test cases in a directory called `out`, you would invoke:
 
 ```shell
-$ deepstate-angr --num_workers 4 --output_test_dir out $DEEPSTATE/build/examples/IntegerOverflow
+deepstate-angr --num_workers 4 --output_test_dir out $DEEPSTATE/build/examples/IntegerOverflow
 ```
 
  The resulting `out` directory should look something like:
diff --git a/bin/deepstate/common.py b/bin/deepstate/common.py
index fe675b1..0de6ffc 100644
--- a/bin/deepstate/common.py
+++ b/bin/deepstate/common.py
@@ -438,6 +438,7 @@ class DeepState(object):
         return
 
     expr_ea = self.concretize(expr_ea, constrain=True)
+    file_ea = self.concretize(file_ea, constrain=True)    
     constraint = arg != 0
     if not self.add_constraint(constraint):
       expr, _ = self.read_c_string(expr_ea, concretize=False)