In order to support older kernels, we should disable the getentropy USE flag:
* Messages for package dev-libs/libgcrypt-1.10.1-r3:
* The getentropy function requires the getrandom syscall.
* This was introduced in Linux 3.17.
* Your system is currently running Linux 3.10.0-1160.45.1.el7.x86_64.
* Disable the 'getentropy' USE flag or upgrade your kernel.
* ERROR: dev-libs/libgcrypt-1.10.1-r3::gentoo failed (pretend phase):
* Kernel is too old for getentropy
In order to support older kernels, we should disable the
getentropy
USE flag: