CMake support is very invasive and modifies my files

Tried juci with my project which uses Makefile and CMake under it, in a subdirectory (https://github.com/kvakvs/gluonvm) What I got:

• it overwrote my Makefile (very bad)
• it used gcc automatically even if CMakeLists said use clang, well actually i create my CMakefile-based Makefile using shell script and then just run make. So don't assume compiler (bad)
• it assumed own directory structure and dropped CMake cache dir and cache files in project directory, even though makefile tries to keep all build files under _build directory (bad, too many assumptions)

Please don't modify or overwrite project files. This gives bad karma. Please don't assume user build directories or compiler. Perfectly would love to be able to run make (make -j8) and have my project work without juci trying to guess everything for me.