diff --git a/azdev/operations/setup.py b/azdev/operations/setup.py
index f36ff644..bfa72d02 100644
--- a/azdev/operations/setup.py
+++ b/azdev/operations/setup.py
@@ -7,6 +7,8 @@
 import os
 from shutil import copytree, rmtree
 import time
+import sys
+import warnings
 
 from knack.log import get_logger
 from knack.util import CLIError
@@ -71,37 +73,37 @@ def _install_cli(cli_path):
         )
         pip_cmd("install -q {}".format(whl_list), "Installing private whl files...")
 
-    # install general requirements
-    pip_cmd(
-        "install -q -r {}/requirements.txt".format(cli_path),
-        "Installing `requirements.txt`..."
-    )
-
-    # command modules have dependency on azure-cli-core so install this first
-    pip_cmd(
-        "install -q -e {}/src/azure-cli-nspkg".format(cli_path),
-        "Installing `azure-cli-nspkg`..."
-    )
-    pip_cmd(
-        "install -q -e {}/src/azure-cli-telemetry".format(cli_path),
-        "Installing `azure-cli-telemetry`..."
-    )
-    pip_cmd(
-        "install -q -e {}/src/azure-cli-core".format(cli_path),
-        "Installing `azure-cli-core`..."
-    )
-
-    # azure cli has dependencies on the above packages so install this one last
-    pip_cmd("install -q -e {}/src/azure-cli".format(cli_path), "Installing `azure-cli`...")
-    pip_cmd(
-        "install -q -e {}/src/azure-cli-testsdk".format(cli_path),
-        "Installing `azure-cli-testsdk`..."
-    )
-
-    # Ensure that the site package's azure/__init__.py has the old style namespace
-    # package declaration by installing the old namespace package
-    pip_cmd("install -q -I azure-nspkg==1.0.0", "Installing `azure-nspkg`...")
-    pip_cmd("install -q -I azure-mgmt-nspkg==1.0.0", "Installing `azure-mgmt-nspkg`...")
+    src_path = '{}/src/'.format(cli_path)
+    local_distributables = ' '.join(
+        root
+        for root, dirs, files in os.walk(src_path)
+        if 'setup.py' in files)
+
+    python_major_version = sys.version_info[0]
+
+    if sys.platform.startswith('darwin'):
+        requirements_file = "{}/src/azure-cli/requirements.py{}.Darwin.txt".format(cli_path, python_major_version)
+    elif sys.platform.startswith('win32'):
+        requirements_file = "{}/src/azure-cli/requirements.py{}.Windows.txt".format(cli_path, python_major_version)
+    elif sys.platform.startswith('linux'):
+        requirements_file = "{}/src/azure-cli/requirements.py{}.Linux.txt".format(cli_path, python_major_version)
+
+    if requirements_file:
+        pip_cmd(
+            "install -q --no-deps -e {}".format(local_distributables),
+            "Installing packages found in this repository..."
+        )
+
+        pip_cmd(
+            "install -q -r {}".format(requirements_file),
+            "Installing external dependencies...",
+        )
+    else:
+        warnings.warn('platform {} does not have pinned dependencies, using latest compatible from PyPI.')
+        pip_cmd(
+            "install -q -e {}".format(local_distributables),
+            "Installing all packages...",
+        )
 
 
 def _copy_config_files():