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);
    return g_chainman.m_blockman.m_block_index;
}
static void AlertNotify(const std::string& strMessage)
{
    uiInterface.NotifyAlertChanged();
#if HAVE_SYSTEM
    std::string strCmd = gArgs.GetArg("-alertnotify", "");
    if (strCmd.empty()) return;
    
    
    
    std::string singleQuote("'");
    std::string safeStatus = SanitizeString(strMessage);
    safeStatus = singleQuote+safeStatus+singleQuote;
    boost::replace_all(strCmd, "%s", safeStatus);
    std::thread t(runCommand, strCmd);
    t.detach(); 
#endif
}
static void CheckForkWarningConditions() EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
    AssertLockHeld(cs_main);
    
    
    if (::ChainstateActive().IsInitialBlockDownload())
        return;