Currently, you need the GPFS library to be able to build the GPFS VFS module, but it should be possible to build with the headers only. Metze addressed this issue with commit 54d8b2fc in master. This one should be fixed in 3.4 also.
Created attachment 4903 [details] proposed patch provided by Metze
Pushed to v3-4-test. Closing out bug report. Thanks!
Created attachment 5177 [details] Patch for v3-3 We also need this for 3.3.x
Pushed to v3-3-test. Will be inlcuded in 3.3.10. Closing out bug report. Thanks, Metze!