The nhCheckInstallPreReqs gives a "Pass" on all checks, but the install still fails with the following error during DB create with fatal error:
fork_level=1 DuplicateHandle() failed: fd 15 handle 0xc type 1: The handle is invalid.
This is an issue with the nhCheckInstallPreReqs. It is not checking for the package gcc-4.4.7-4.el6.x86_64. You will need to install this package on the system and rerun the installation.
This is Linux only.