Python options like PYTHONSAFEPATH or -P [1] do not add script
directory to PYTHONPATH. ynl depends on this path to build and run.

[1] This option is default for Fedora rpmbuild since introduction of
    https://fedoraproject.org/wiki/Changes/PythonSafePath

Signed-off-by: Jan Stancek <jstancek@redhat.com>
---
 tools/net/ynl/cli.py       | 3 +++
 tools/net/ynl/ethtool.py   | 2 ++
 tools/net/ynl/ynl-gen-c.py | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/tools/net/ynl/cli.py b/tools/net/ynl/cli.py
index b8481f401376..873463dbdcc0 100755
--- a/tools/net/ynl/cli.py
+++ b/tools/net/ynl/cli.py
@@ -3,9 +3,12 @@
 
 import argparse
 import json
+import pathlib
 import pprint
+import sys
 import time
 
+sys.path.append(pathlib.Path(__file__).resolve().parent.as_posix())
 from lib import YnlFamily, Netlink, NlError
 
 
diff --git a/tools/net/ynl/ethtool.py b/tools/net/ynl/ethtool.py
index 63c471f075ab..ebb0a11f67bf 100755
--- a/tools/net/ynl/ethtool.py
+++ b/tools/net/ynl/ethtool.py
@@ -3,11 +3,13 @@
 
 import argparse
 import json
+import pathlib
 import pprint
 import sys
 import re
 import os
 
+sys.path.append(pathlib.Path(__file__).resolve().parent.as_posix())
 from lib import YnlFamily
 
 def args_to_req(ynl, op_name, args, req):
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 717530bc9c52..a86e88019e22 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -4,12 +4,15 @@
 import argparse
 import collections
 import filecmp
+import pathlib
 import os
 import re
 import shutil
+import sys
 import tempfile
 import yaml
 
+sys.path.append(pathlib.Path(__file__).resolve().parent.as_posix())
 from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, SpecEnumEntry
 
 
-- 
2.43.0