ROOT takes days filling a few histograms in my pc

[Wile_E_Coyote]

These old “./configure” based instructions are for ROOT 5.

For ROOT 6, use “CMake / make” (the classical “configure / make” based method is known to be broken, i.e. not supported any more).

Installing ROOT_v6.14.00 in linux

Try to follow the procedure from this post (just replace the “6.10.08” version there with your “6.14.00”): Please note also that the ROOT Team provides ready to use binary distributions and maybe your “operating system version + compiler version” is one of the supported distributions.