Update README.md

README.md

@@ -27,7 +27,8 @@ Clone this repository with the following command line:
 git clone https://gitlab.pasteur.fr/vlegrand/FQreport.git
 ```
 
-In a command-line window, go to the _src directory and create a build_ directory, and type:
+You need a c++ compiler that supports the C++11 standard and cmake to build the executable.
+In a command-line window, go to the _src directory and create a build_ directory;then type:
 
 ```bash
 cd build