Updated Compile from source in Linux (markdown)

Compile-from-source-in-Linux.md

@@ -12,6 +12,8 @@ Be aware that if you choose a different distribution with earlier versions these
 
 The minimal standard required for the C++ compiler is c++14
 
+Be aware that it will try to apply the highest SIMD capabilities available on your CPU i.e. AVX2 > AVX > SSE4 ... So for best results make sure you run the program on the computer on which you compile or you are using the compiled binaries on a computer with similar SIMD capabilities (check the CPU flags with `cat /proc/cpuinfo`). The typical issue encountered when running hardware is not compatible is a SIGILL exception with a message like `Program received signal SIGILL, Illegal instruction`.
+
 It assumes <code>/opt/build</code> is the base for the sources used to build and <code>/opt/installation</code> is the base for the installation directories. It is assumed these directories are owned by your user. Hence assuming the user is <code>user</code> in group <code>users</code> you would do the following to create them (once):
 
 <pre><code>sudo mkdir -p /opt/build