Rinex data processing for L5 frequency only

[WhiteOwlFire]

I'd like to know if it's possible to process observation files using L5 frequency only. By converting the observation file and then processing it, I should obtain a pos file. However, when I analyze the converted file, the resulting pos file is empty. Is it possible to analyze observation files for L5 frequency only? Do we necessarily need the L1 base frequency to obtain a result? Is it necessary to modify the source code to obtain a unique L5 analysis?

Note that when I process a file converted for L1 + L5 frequencies, the resulting pos file is identical to the pos file obtained with L1 only.