Update README.md

Author: vsoftco

README.md

@@ -12,7 +12,7 @@ The wrapper is written in standard C++11, hence in the following it is assumed t
 
 ## Pre-requisites
 
-liboqs-cpp depends on the [liboqs](https://github.com/open-quantum-safe/liboqs) C library; liboqs master branch must first be compiled as a Linux/macOS/Windows library, see the specific platform building instructions below.
+liboqs-cpp depends on the [liboqs](https://github.com/open-quantum-safe/liboqs) C library; liboqs master branch must first be compiled as a Linux/macOS/Windows library (i.e. using `ninja install` with `-DBUILD_SHARED_LIBS=ON` during configuration), see the specific platform building instructions below.
 
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