modifs to run cmake correctly on Ubuntu 14.04 as well, documentation

CMakeLists.txt

@@ -4,13 +4,12 @@ project(macaon2)
 
 add_definitions("-Wall" )
 
-# for gcc < 5.3
+if (${CMAKE_C_COMPILER_VERSION} VERSION_LESS 5.3)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
-
 	# better, but needs CMake >= 3.0
 	#set_property(GLOBAL PROPERTY CXX_STANDARD 11)
 	#set_property(GLOBAL PROPERTY C_STANDARD 11)
-
+endif()
 
 # activate with cmake -DMACA_EXPORT=TRUE 
 # to use macaon in python/java (with swig)

INSTALL

@@ -16,8 +16,15 @@ The basic procedure to build and install macaon from sources is the following.
   If you want to install macaon locally, you can specify the install path with :
     cmake -DCMAKE_INSTALL_PREFIX:PATH=/absolute/path/to/macaon_install_dir ..
 
-  If you want to create a library to use in python
+  If you want to create a library to use in python or java
     cmake -DMACA_EXPORT=TRUE ..
+  you need to install the following packages on Ubuntu
+	sudo apt-get install swig
+	sudo apt-get install libpython2.7-dev
+
+	sudo apt-get install openjdk-8-jdk 
+     or
+	sudo apt-get install openjdk-7-jdk 
 
 - Build the sources with:
     make