It was this version whose source code was later released (the DOS version could not be released due to copyright issues concerning the sound library). Originally, the code was distributed under the Doom Source License, but it was later reissued under the GNU General Public License.
Source ports running on Linux
The 2020 remaster for Doom 64 has not been released for Linux, but the earlier Doom 64 EX port is compatible. The Doom64EX-Plus fork is compatible with the DOOM64.WAD from the remaster as of version 3.6.0.