diff --git a/README.rst b/README.rst
index 3497a8c..1abbb93 100644
--- a/README.rst
+++ b/README.rst
@@ -42,6 +42,9 @@ Example ``autospec.conf`` file::
 **packages_file**
     Optional path to add autodetected runtime requirement checking against
 
+**yum_conf**
+    Optional path to yum configuration
+
 **upstream**
     Base URL for stored upstream tarballs
 
diff --git a/autospec/autospec.py b/autospec/autospec.py
index f56b56e..62974b1 100644
--- a/autospec/autospec.py
+++ b/autospec/autospec.py
@@ -35,6 +35,7 @@ import test
 import commitmessage
 import pkg_integrity
 import specfiles
+import pkg_scan
 
 from util import print_fatal, binary_in_path, write_out
 from abireport import examine_abi
@@ -219,6 +220,7 @@ def main():
             pass
 
     examine_abi(build.download_path)
+    pkg_scan.get_whatrequires(tarball.name)
 
     write_out(build.download_path + "/release", tarball.release + "\n")
 
diff --git a/autospec/config.py b/autospec/config.py
index 6374d52..3058956 100644
--- a/autospec/config.py
+++ b/autospec/config.py
@@ -60,6 +60,7 @@ old_patches = list()
 old_keyid = None
 profile_payload = None
 signature = None
+yum_conf = None
 
 failed_commands = {}
 maven_jars = {}
@@ -452,6 +453,7 @@ def parse_config_files(path, bump, filemanager):
     global make_install_append
     global patches
     global autoreconf
+    global yum_conf
 
     packages_file = None
 
@@ -470,6 +472,7 @@ def parse_config_files(path, bump, filemanager):
         license_fetch = config['autospec'].get('license_fetch', None)
         license_show = config['autospec'].get('license_show', None)
         packages_file = config['autospec'].get('packages_file', None)
+        yum_conf = config['autospec'].get('yum_conf', None)
         if not packages_file:
             print("Warning: Set [autospec][packages_file] path to package list file for "
                   "requires validation")
@@ -483,6 +486,9 @@ def parse_config_files(path, bump, filemanager):
         print("Warning: Set [autospec][license_fetch] uri for license fetch support")
     if not license_show:
         print("Warning: Set [autospec][license_show] uri for license link check support")
+    if not yum_conf:
+        print("Warning: Set [autospec][yum_conf] path to yum.conf file for whatrequires validation")
+        yum_conf = os.path.join(os.path.dirname(config_file), "image-creator/yum.conf")
 
     if packages_file:
         os_packages = set(read_conf_file(packages_file))
diff --git a/autospec/git.py b/autospec/git.py
index 2881f24..2625f46 100644
--- a/autospec/git.py
+++ b/autospec/git.py
@@ -75,6 +75,7 @@ def commit_to_git(path):
     call("git add profile_payload", check=False, stderr=subprocess.DEVNULL, cwd=path)
     call("git add options.conf", check=False, stderr=subprocess.DEVNULL, cwd=path)
     call("git add configure_misses", check=False, stderr=subprocess.DEVNULL, cwd=path)
+    call("git add whatrequires", check=False, stderr=subprocess.DEVNULL, cwd=path)
 
     # remove deprecated config files
     call("git rm use_clang", check=False, stderr=subprocess.DEVNULL, cwd=path)
diff --git a/autospec/pkg_scan.py b/autospec/pkg_scan.py
new file mode 100644
index 0000000..2f9ca34
--- /dev/null
+++ b/autospec/pkg_scan.py
@@ -0,0 +1,48 @@
+#
+# pkg_scan.py - part of autospec
+# Copyright (C) 2017 Intel Corporation
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+import subprocess
+import util
+import config
+
+
+def get_whatrequires(pkg):
+    """
+    Write list of packages that require current package to file
+    using repoquery what-requires and --recursive commands
+    """
+
+    # clean up yum cache to avoid 'no more mirrors repo' error
+    subprocess.check_output(['yum', '--config', config.yum_conf,
+                             'clean', 'all'])
+
+    try:
+        out = subprocess.check_output(['repoquery', '--config', config.yum_conf,
+                                       '--archlist=src', '--recursive',
+                                       '--whatrequires', pkg]).decode('utf-8')
+
+    except subprocess.CalledProcessError as err:
+        util.print_warning("repoquery whatrequires for {} failed with: {}".format(pkg, err))
+        return
+
+    if 'filesystem' in out:
+        util.print_warning("Package contains filesystem as a whatrequires.\n" +
+                           "BE CAREFUL building {}; may require full OS rebuild.\n".format(pkg))
+
+    util.write_out('whatrequires',
+            "# This file contains recursive sources that require this package\n" + \
+            out)