update install.sh to build tor on macOS

install.sh

@@ -89,7 +89,9 @@ tor_deps_install ()
         'libssl-dev' \
         'zlib1g-dev' )
 
-    # TODO: darwin_deps
+    darwin_deps=( \
+        'libevent' \
+        'zlib' )
 
     if [[ ${use_os_deps_check} != '1' ]]; then
         return 0
@@ -97,8 +99,8 @@ tor_deps_install ()
         deb_deps_install "${debian_deps[@]}"
         return "$?"
     elif [[ ${install_os} == 'darwin' ]]; then
-        echo "FixMe: Darwin deps not specified. Trying to build."
+        dar_deps_install "${darwin_deps[@]}"
-        return 0
+        return "$?"
     else
         return 0
     fi
@@ -137,17 +139,19 @@ dar_deps_install ()
         return 1
     fi
 
-    sudo_command=''
+    if ! which virtualenv >/dev/null; then
-    if [ "$with_sudo" == 1 ]; then
+        sudo_command=''
-        echo "
+        if [ "$with_sudo" == 1 ]; then
-            sudo password required to run :
+            echo "
+                sudo password required to run :
 
-            \`sudo pip3 install virtualenv\`
+                \`sudo pip3 install virtualenv\`
-            "
+                "
-        sudo_command="sudo"
+            sudo_command="sudo"
-    fi
+        fi
-    if $with_jmvenv && ! $sudo_command pip3 install virtualenv; then
+        if $with_jmvenv && ! $sudo_command pip3 install virtualenv; then
-        return 1
+            return 1
+        fi
     fi
 }