diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4666084..fcbf268 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,11 @@ cmake_minimum_required(VERSION 3.4.0)
 
 project(mathx CXX)
 
+# Force out-of-tree builds
+if("${PROJECT_SOURCE_DIR}" STREQUAL "${PROJECT_BINARY_DIR}")
+   message(SEND_ERROR "In-source builds are not allowed.")
+endif("${PROJECT_SOURCE_DIR}" STREQUAL "${PROJECT_BINARY_DIR}")
+
 # Include header files
 include_directories(mathx)
 
diff --git a/README.md b/README.md
index 9594362..718ee5c 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ We require the following packages before you try installing the package.
 
  - A c++ compiler (g++/clang++/msvc++)
  - Cmake (upwards of version 3.4)
+ - pkg-config (optional)
 
 ### Instructions
 
@@ -21,15 +22,16 @@ We require the following packages before you try installing the package.
  ```
 
  - Use the cmake command with CMAKE_INSTALL_PREFIX to select the directory to install to (not using this command will defaul to install directories)
+ We do not support in tree builds.
 
  ```
- $ cmake -DCMAKE_INSTALL_PREFIX=/path/to/install
+ $ cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/install
  ```
 
  For example, one can type:
 
  ```
- $ cmake -DCMAKE_INSTALL_PREFIX=/home/user/mathx_build/
+ $ cmake -DCMAKE_INSTALL_PREFIX=/home/user/opt/build
  ```
 
  - If cmake runs successfully, you should now be able to see a `Makefile` in the build directory. We currently support `clean` and `all` only. We will add more targets with future upgrades to cmake. Run:
@@ -44,18 +46,19 @@ We require the following packages before you try installing the package.
  $ make install
  ```
 
+ - To build mathx based applications using terminal/makefile, we highly recommend using pkg-config. To use pkg-config, you will have
+ to `export` pkg-config path. Run:
+
+ ```
+ $ export PKG_CONFIG_PATH=${PKG_CONFIG_PATH}:/path/to/install/lib/pkgconfig
+ ```
+
  __NOTE__: If you fail to provide the CMAKE_INSTALL_PREFIX, install location will be set to default (For example: /usr/local/ in case of Linux users.)
 
 ## Usage Instructions
 
-Currently we do not support pkg-config so users will have to manually add the `includes` and `lib` using their respective flags.
+The user can simply build applications using pkg-config. A simple example is given as:
 
-Manually building:
-
-```
-(CXX_COMPILER) -o exec_name (CXX_FILES) -I/path/to/include -L/path/to/lib
 ```
-
-__NOTE__: You dont need to provide the last two flags if library is installed in the default location.
-
-We are updating our CMakelists to provide more functionality to the users.
+(CXX_COMPILER) -o exec_name (CXX_FILES) `pkg-config --cflags --libs mathx`
+```
\ No newline at end of file