dissect+peek: avoid deprecated ndn-cxx functions

Change-Id: Ibd9f8ad30e315f537d1560db823372af3d58d713
diff --git a/wscript b/wscript
index 92b710c..0bfb7f6 100644
--- a/wscript
+++ b/wscript
@@ -27,8 +27,9 @@
 
     conf.env.WITH_TESTS = conf.options.with_tests
 
-    conf.check_cfg(package='libndn-cxx', args=['--cflags', '--libs'], uselib_store='NDN_CXX',
-                   pkg_config_path=os.environ.get('PKG_CONFIG_PATH', '%s/pkgconfig' % conf.env.LIBDIR))
+    pkg_config_path = os.environ.get('PKG_CONFIG_PATH', f'{conf.env.LIBDIR}/pkgconfig')
+    conf.check_cfg(package='libndn-cxx', args=['libndn-cxx >= 0.8.0', '--cflags', '--libs'],
+                   uselib_store='NDN_CXX', pkg_config_path=pkg_config_path)
 
     boost_libs = ['system', 'program_options', 'filesystem']
     if conf.env.WITH_TESTS: