https://github.com/bitcoin/bitcoin/blob/68f3c7eb080e461cfeac37f8db7034fe507241d0/src/prevector.h#L152-L158

I'm opening an issue as its fix is too tiny to become a pull request.

Can be solved by renaming the struct to
```c
     struct indirect_contents { 
         size_type capacity; 
         char* indirect; 
     }; 
```
{
    {
        LOCK(cs_main);
        for (const CBlockHeader& header : headers) {
            CBlockIndex *pindex = nullptr; 
            bool accepted = g_chainman.m_blockman.AcceptBlockHeader(
                header, state, chainparams, &pindex);
            ::ChainstateActive().CheckBlockIndex(chainparams.GetConsensus());
            if (!accepted) {
                return false;
            }
            if (ppindex) {
                *ppindex = pindex;
            }
        }
    }
    if (NotifyHeaderTip()) {
        if (::ChainstateActive().IsInitialBlockDownload() && ppindex && *ppindex) {
            LogPrintf("Synchronizing blockheaders, height: %d (~%.2f%%)\n", (*ppindex)->nHeight, 100.0/((*ppindex)->nHeight+(GetAdjustedTime() - (*ppindex)->GetBlockTime()) / Params().GetConsensus().nPowTargetSpacing) * (*ppindex)->nHeight);
        }
    }
    return true;
}
static FlatFilePos SaveBlockToDisk(const CBlock& block, int nHeight, const CChainParams& chainparams, const FlatFilePos* dbp) {