port build system

cmake/Modules/fooConfig.cmake

@@ -1,4 +1,6 @@
-INCLUDE(FindPkgConfig)
+if(NOT PKG_CONFIG_FOUND)
+    INCLUDE(FindPkgConfig)
+endif()
 PKG_CHECK_MODULES(PC_FOO foo)
 
 FIND_PATH(

cmake/Modules/targetConfig.cmake.in

@@ -1,21 +1,7 @@
 # Copyright 2018 Free Software Foundation, Inc.
 #
-# This file is part of GNU Radio
+# SPDX-License-Identifier: GPL-3.0-or-later
 #
-# GNU Radio 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, or (at your option)
-# any later version.
-#
-# GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
 
 include(CMakeFindDependencyMacro)