Update README.MacOSX (#3758)

README.MacOSX

-Target OS: MacOS X "El Capitan"
+Target OS: MacOS X "High Sierra"
 
 In the Homebrew environment, you can download the latest tarantool package
 with a single command:
@@ -19,7 +19,7 @@ sudo xcode-select --install
 sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer
 
 For Homebrew:
-brew install cmake readline
+brew install cmake readline icu4c openssl
 
 For MacPorts:
 port install autoconf binutils cmake ncurses zlib readline
@@ -33,7 +33,7 @@ To install these packages, we recommend easy_install, pip, or setup.py.
 
 For easy_install:
 sudo easy_install pyyaml
-sudo easy_install python-daemon
+sudo easy_install argparse
 sudo easy_install msgpack-python
 sudo easy_install gevent
 sudo easy_install six
@@ -63,6 +63,8 @@ cd tarantool
 mkdir build && cd build
 cmake .. \
 -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+-DCURL_INCLUDE_DIR=$(xcode-select --sdk macosx --show-sdk-path)/usr/include \
+-DCURL_LIBRARY=/usr/lib/libcurl.dylib \
 -DDARWIN_BUILD_TYPE=Ports
 make
 
@@ -70,9 +72,16 @@ In this example, we are making a developer's build (-DCMAKE_BUILD_TYPE=RelWithDe
 with cmake using MacPorts (-DDARWIN_BUILD_TYPE=Ports). To build a release version,
 set -DCMAKE_BUILD_TYPE=Release.
 
-Remember also to set up the cmake's flag -DDARWIN_BUILD_TYPE depending on the package 
+Remember also to set up the cmake's flag -DDARWIN_BUILD_TYPE depending on the package
 manager you use ('-DDARWIN_BUILD_TYPE=None' for Xcode Tools and Homebrew, and
-'-DDARWIN_BUILD_TYPE=None' for MacPorts).
+'-DDARWIN_BUILD_TYPE=Ports' for MacPorts). It is set to None by default.
+
+Some Homebrew formulas are "keg-only", which means that they're not
+symlinked into `/usr/local`. So, if you have used Homebrew for
+dependencies, you would need following flags for it to find `openssl`
+and GNU `readline`:
+
+-DOPENSSL_ROOT_DIR=$(brew --prefix openssl) -DREADLINE_ROOT=$(brew --prefix readline)
 
 4. Run tarantool test suite
 -------------