Minor update

Author: cjain7

INSTALL.txt

@@ -1,5 +1,5 @@
 This software requires c++11 to build,
-which is available in and GCC >= 4.8 and OSX >= 10.7.
+which is available in and GCC >= 4.8 (on linux) and Clang >= 3.3 (on mac)
 
 Dependencies:
 -------------
@@ -10,8 +10,8 @@ Dependencies:
        Boost Library ( http://www.boost.org ) (see "-with-boost" below)
    - Zlib ( included with OS X and most Linuxes, http://www.zlib.net ) *
    - C++ compiler with C++11 and openmp support
-       The standard way to link OpenMP while using Apple Clang on macOS seems to be using "libomp"
-       which is available through brew ( https://formulae.brew.sh/formula/libomp )
+       Note for macOS users: Use "libomp" to link OpenMP with Clang
+       libomp is available through brew ( https://formulae.brew.sh/formula/libomp )
 
 
 Steps: