Created attachment 747105 [details, diff] patch to resove the issue Compilation without problems. During execution, when creating an "polar save filename" the following error occurs: At line 519 of file ../src/xpol.f (unit = 11, file = 'esr') Fortran runtime error: Sequential READ or WRITE not allowed after EOF marker, possibly use REWIND or BACKSPACE Error termination. Backtrace: #0 0x7fba7dd2c6f0 in ??? #1 0x7fba7dd2d269 in ??? #2 0x7fba7df66ffd in ??? #3 0x5631bfc759a0 in ??? #4 0x5631bfc457fd in ??? #5 0x5631bfc30d63 in ??? #6 0x5631bfc2871e in ??? #7 0x7fba7da247fc in __libc_start_main #8 0x5631bfc28749 in ??? #9 0xffffffffffffffff in ??? Issue can be resolved by applying the provided patch (SequentialREADorWRITE.patch).
https://src.fedoraproject.org/rpms/xfoil/tree/f35 while at it, there are some more patches for xfoil.