ubuntu 20.04: make pkg/tarball failed

Hi,

I'm trying to build o-charts on ubuntu 20.04

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ../
make pkg
Scanning dependencies of target pkg-conf
-- Cmake version: 3.16.3.
-- Building: pkg
-- Selected upload repository: david-register/ocpn-plugins-unstable
-- *** Staging to build o-charts_pi ***
-- Found Gettext: /usr/bin/msgmerge (found version "0.19.8.1") 
-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libOpenGL.so   
-- Found wxWidgets: -L/usr/lib/x86_64-linux-gnu;-pthread;;;-lwx_baseu-3.0;-lwx_gtk3u_core-3.0;-lwx_baseu_net-3.0;-lwx_baseu_xml-3.0;-lwx_gtk3u_html-3.0;-lwx_gtk3u_adv-3.0 (found version "3.0.4") 
-- Found CURL: /usr/lib/x86_64-linux-gnu/libcurl.so (found version "7.68.0")  
-- PluginLocalization...GETTEXT_XGETTEXT_EXECUTABLE: /usr/bin/xgettext
-- Using bundled tinyxml
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11") 
CMake Error at libs/oeserverd/CMakeLists.txt:31 (configure_file):
  configure_file Problem configuring file

CMake Error at libs/oeserverd/CMakeLists.txt:35 (configure_file):
  configure_file Problem configuring file

-- Configuring incomplete, errors occurred!
See also "/home/oleg/tmp/o-charts_pi/build/CMakeFiles/CMakeOutput.log".
make[3]: *** [CMakeFiles/pkg-conf.dir/build.make:57: pkg-conf] Error 1
make[2]: *** [CMakeFiles/Makefile2:135: CMakeFiles/pkg-conf.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:412: CMakeFiles/pkg.dir/rule] Error 2
make: *** [Makefile:261: pkg] Error 2

regarding free-x

bdbcat / o-charts_pi

ubuntu 20.04: make pkg/tarball failed #12