Found the following significant warnings:
  icu55/unicode/urename.h:979:48: warning: ‘int32_t uidna_toASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/common/uidna.cpp:513:85: warning: ‘int32_t uidna_toASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/common/uidna.cpp:526:80: warning: ‘int32_t uidna_toASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/unicode/urename.h:966:51: warning: ‘int32_t uidna_IDNToASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/common/uidna.cpp:876:87: warning: ‘int32_t uidna_IDNToASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/common/uidna.cpp:887:83: warning: ‘int32_t uidna_IDNToASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/common/uidna.cpp:891:85: warning: ‘int32_t uidna_IDNToASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/common/uidna.cpp:902:86: warning: ‘int32_t uidna_IDNToASCII_55_stringi(const UChar*, int32_t, UChar*, int32_t, int32_t, UParseError*, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/unicode/urename.h:758:54: warning: ‘uint32_t ucol_setVariableTop_55_stringi(UCollator*, const UChar*, int32_t, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/i18n/ucol_sit.cpp:543:92: warning: ‘uint32_t ucol_setVariableTop_55_stringi(UCollator*, const UChar*, int32_t, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/unicode/urename.h:749:58: warning: ‘void ucol_restoreVariableTop_55_stringi(UCollator*, uint32_t, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
  icu55/i18n/ucol_sit.cpp:545:71: warning: ‘void ucol_restoreVariableTop_55_stringi(UCollator*, uint32_t, UErrorCode*)’ is deprecated [-Wdeprecated-declarations]
See ‘/home/ripley/R/packages/tests32/stringi.Rcheck/00install.out’ for details.