diff --git a/BUILD.md b/BUILD.md
new file mode 100644
index 00000000..968b5b84
--- /dev/null
+++ b/BUILD.md
@@ -0,0 +1,15 @@
+# Windows
+Windows => Use precompiled binary, or compile it with VS2008/2010 (Express or pro, Pro will allow you to enable Opemp in CMVS)
+        => Use CMake GUI in order to generate the Visual Studio project file (in ./program you will find the main CMakeLists.txt).
+
+# Linux compilations (Ubuntu used as example)
+```
+#Prepare an empty machine for building:
+sudo apt-get update -qq && sudo apt-get install -qq
+sudo apt-get -y install git jpeg boost boost-graph
+git clone https://github.com/pmoulon/CMVS-PMVS
+mkdir CMVS-PMVS_build && cd CMVS-PMVS_build
+cmake ../CMVS-PMVS/program
+make
+sudo make install
+```
diff --git a/README b/README
index 25a7d3ab..9027231e 100644
--- a/README
+++ b/README
@@ -1,5 +1,8 @@
 This is a modified version of CMVS/PMVS.
 
+Building:
+ - See https://github.com/pmoulon/CMVS-PMVS/BUILD.md
+
 Main modification:
  - cross platform compilation Linux, Windows => CMake build system generator.
  - added bug fix from Nghia Ho.
diff --git a/Readme.txt b/Readme.txt
index 6eeb2d45..96f87633 100644
--- a/Readme.txt
+++ b/Readme.txt
@@ -18,19 +18,7 @@ Date : 13 July 2011
 -- Compilation  --
 --------------------
 
-Windows => Use precompiled binary, or compile it with VS2008/2010 (Express or pro, Pro will allow you to enable Opemp in CMVS)
-        => Use CMake GUI in order to generate the Visual Studio project file (in ./program you will find the main CMakeLists.txt).
-
-Linux => use makefile in program/main.
-
- Or use CMake build system :
-=> Install the following libraries : jpeg boost boost-graph
- $ mkdir OutputLinux
- $ cd OutputLinux
- $ cmake . ..
- $ make
- => That's all. Openmp is not activated yet. Add openmp in the cmvs link option and define the _OPENMP cxx flags
-
+- See https://github.com/pmoulon/CMVS-PMVS/BUILD.md
 
 --------------------
 ----  Notes :   ----
diff --git a/program/CMakeLists.txt b/program/CMakeLists.txt
index 2a4cd941..61d2d438 100644
--- a/program/CMakeLists.txt
+++ b/program/CMakeLists.txt
@@ -30,6 +30,9 @@ INCLUDE_DIRECTORIES(
 FIND_PACKAGE(Threads REQUIRED)
 SET(PMVS_LIBRARIES ${PMVS_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
 
+# OPTIONS
+OPTION(CIMG_USE_OPENMP "Enable OpenMP parallelization in cimg" ON)
+
 # Eigen
 SET( EIGEN3_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/thirdParty/Eigen )
 SET( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${EIGEN3_INCLUDE_DIR}/cmake" )
@@ -95,6 +98,30 @@ IF(PMVS_USE_TIFF)
   ENDIF(TIFF_FOUND)
 ENDIF(PMVS_USE_TIFF)
 
+# OpenMP
+# ==============================================================================
+# OpenMP detection
+# ==============================================================================
+IF(CIMG_USE_OPENMP)
+  FIND_PACKAGE(OpenMP)
+  IF(OPENMP_FOUND)
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+    OPTION(CIMG_USE_OPENMP "Use OpenMP for parallelization in cimg" ON)
+    ADD_DEFINITIONS(-DCIMG_USE_OPENMP)
+    IF (NOT MSVC)
+      IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+        # for those using the clang with OpenMP support
+        LIST(APPEND OPENMVG_LIBRARY_DEPENDENCIES iomp)
+      ELSE()
+        LIST(APPEND OPENMVG_LIBRARY_DEPENDENCIES gomp)
+      ENDIF()
+    ENDIF(NOT MSVC)
+  ENDIF(OPENMP_FOUND)
+ELSE(CIMG_USE_OPENMP)
+    OPTION(OpenMVG_USE_OPENMP "Use OpenMP for parallelization in cimg" OFF)
+    UPDATE_CACHE_VARIABLE(CIMG_USE_OPENMP OFF)
+    REMOVE_DEFINITIONS(-DCIMG_USE_OPENMP)
+ENDIF(CIMG_USE_OPENMP)
 
 ADD_SUBDIRECTORY(base)
 ADD_SUBDIRECTORY(main)