FTBFS: new "compton" does not build on older distro

Hello, I've noticed that the new "compton" stuff (from tdebase package) does not build on RHEL6 : Linking C executable compton-tde cd "/dev/shm/BUILD.el6.x86_64/trinity-tdebase-14.0.0~pre1185+8083ca83/build/twin/compton-tde" && /usr/bin/cmake -E cmake_link_script CMakeFiles/compton-tde.dir/link.txt --verbose=1 /usr/lib64/ccache/gcc -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -DNDEBUG -fvisibility=hidden -fvisibility-inlines-hidden -DNDEBUG CMakeFiles/compton-tde.dir/c2.c.o CMakeFiles/compton-tde.dir/compton.c.o CMakeFiles/compton-tde.dir/opengl.c.o -o compton-tde -rdynamic -lm -lGL -lconfig -lXinerama -lXrender -lX11 -lXrandr -lXfixes -lXdamage -lXfixes -lXext -lXcomposite -lXdamage -lXext -lXcomposite -Wl,-rpath,:::::::::::::::::: CMakeFiles/compton-tde.dir/compton.c.o: In function `parse_config': /dev/shm/BUILD.el6.x86_64/trinity-tdebase-14.0.0~pre1185+8083ca83/twin/compton-tde/compton.c:5580: undefined reference to `config_set_include_dir' collect2: ld returned 1 exit status make[3]: *** [twin/compton-tde/compton-tde] Error 1 make[3]: Leaving directory `/dev/shm/BUILD.el6.x86_64/trinity-tdebase-14.0.0~pre1185+8083ca83/build' make[2]: *** [twin/compton-tde/CMakeFiles/compton-tde.dir/all] Error 2 make[2]: Leaving directory `/dev/shm/BUILD.el6.x86_64/trinity-tdebase-14.0.0~pre1185+8083ca83/build' make[1]: *** [all] Error 2 make[1]: Leaving directory `/dev/shm/BUILD.el6.x86_64/trinity-tdebase-14.0.0~pre1185+8083ca83/build' The libconfig version is 1.3.2 . There is no "config_set_include_dir" anywhere in /usr/include/* . Please, either find a way to build on older distro, or make the whole feature optional (with a cmake option). Thanks François