OpenFOAM v2306 gives YY_BUF_SIZE declare in scope error

I'm trying to compile openfoam v2306 on Centos 7.9 and I got YY_BUF_SIZE declare in scope error. Compiling process is attached to issue.compiling_openfoam_v2306.txt

There was an error about ADIOS2 compiling too, on this github issue https://github.com/ornladios/ADIOS2/issues/3742, they fix the error. Maybe this is about OpenFoam compiling too.

This looks like a non-standard configuration. AFIAK centos-7 still had gcc-4.8.5 and a much older flex. Are your flex headers consistent with the flex version?

You have:

flex=/beegfs/apps/flex/2.6.4/bin/flex

But is the compilation using flex getting the proper FlexLexer.h ?

Find where the FlexLexer.h corresponding to your particular flex version is located.

added community label

Closing out. Seems to be a local configuration issue and there has been no further user response.

closed