Update README

Author: Raghuveer Devulapalli

README.md

@@ -54,7 +54,7 @@ int main() {
 ### Build using gcc
 
 ```
-gcc main.cpp -mavx512f -mavx512dq -O3
+g++ main.cpp -mavx512f -mavx512dq -O3
 ```
 
 This is a header file only library and we do not provide any compile time and
@@ -75,33 +75,40 @@ compiler to build.
 gcc >= 8.x
 ```
 
+### Build using Meson
+
+meson is the recommended build system to build the test and benchmark suite.
+
+```
+meson setup builddir && cd builddir && ninja
+```
+
+It build two executables:
+
+- `testexe`: runs a bunch of tests written in ./tests directory.
+- `benchexe`: measures performance of these algorithms for various data types.
+
+
 ### Build using Make
 
-`make` command builds two executables:
+Makefile uses `-march=sapphirerapids` as a global compile flag and hence it
+will require g++-12. `make` command builds two executables:
 - `testexe`: runs a bunch of tests written in ./tests directory.
 - `benchexe`: measures performance of these algorithms for various data types
   and compares them to std::sort.
 
 You can use `make test` and `make bench` to build just the `testexe` and
 `benchexe` respectively.
 
-### Build using Meson
-
-You can also build `testexe` and `benchexe` using Meson/Ninja with the following
-command:
-
-```
-meson setup builddir && cd builddir && ninja
-```
-
 ## Requirements and dependencies
 
 The sorting routines relies only on the C++ Standard Library and requires a
 relatively modern compiler to build (gcc 8.x and above). Since they use the
 AVX-512 instruction set, they can only run on processors that have AVX-512.
 Specifically, the 32-bit and 64-bit require AVX-512F and AVX-512DQ instruction
 set. The 16-bit sorting requires the AVX-512F, AVX-512BW and AVX-512 VMBI2
-instruction set. The test suite is written using the Google test framework.
+instruction set. The test suite is written using the Google test framework. The
+benchmark is written using the google benchmark framework.
 
 ## References