perl-libxml-mm.c:142:18: error: incompatible function pointer types passing 'void (void *, void *, xmlChar *)' (aka 'void (void *, void *, unsigned char *)') to parameter of type 'xmlHashScanner' (aka 'void (*)(void *, void *, const unsigned char *)') [-Wincompatible-function-pointer-types]
                xmlHashScan(r, PmmRegistryDumpHashScanner, NULL);
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/libxml2/libxml/hash.h:213:22: note: passing argument to parameter 'f' here
                                         xmlHashScanner f,
                                                        ^
perl-libxml-mm.c:234:44: error: incompatible function pointer types passing 'void (void *, xmlChar *)' (aka 'void (void *, unsigned char *)') to parameter of type 'xmlHashDeallocator' (aka 'void (*)(void *, const unsigned char *)') [-Wincompatible-function-pointer-types]
        if( xmlHashRemoveEntry(PmmREGISTRY, name, PmmRegistryHashDeallocator) )
                                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/libxml2/libxml/hash.h:160:47: note: passing argument to parameter 'f' here
                           xmlHashDeallocator f);
                                              ^
perl-libxml-mm.c:301:38: error: incompatible function pointer types passing 'void *(void *, xmlChar *)' (aka 'void *(void *, unsigned char *)') to parameter of type 'xmlHashCopier' (aka 'void *(*)(void *, const unsigned char *)') [-Wincompatible-function-pointer-types]
        reg_copy = xmlHashCopy(PmmREGISTRY, PmmRegistryHashCopier);
                                            ^~~~~~~~~~~~~~~~~~~~~
/usr/local/include/libxml2/libxml/hash.h:208:21: note: passing argument to parameter 'f' here
                                         xmlHashCopier f);
                                                       ^