Problem compiling kstars (cmake): missing dependencies ? - by: patdut

I try to compile kstars from git. I met a problem with cmake:
Could not find a package configuration file provided by "ECM" (requested
version 1.7.0) with any of the following names:

ECMConfig.cmake
ecm-config.cmake

Add the installation prefix of "ECM" to CMAKE_PREFIX_PATH or set "ECM_DIR"
to a directory containing one of the above files. If "ECM" provides a
separate development package or SDK, be sure it has been installed.

I don't know what is missing nor what to do. I have installed all ecm packages (sudo apt install ecm). Can you give me a help ?
Thanks