Found the following significant warnings:
  RlibMVL.c:798:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:924:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:1065:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:1214:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:1382:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:1518:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:934:63: warning: passing 'char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:981:63: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1003:63: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:1656:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1165:3: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1214:60: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:1800:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1360:57: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1506:6: warning: assigning to 'const unsigned char *' from 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1507:6: warning: assigning to 'const unsigned char *' from 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:2081:35: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1592:6: warning: assigning to 'const unsigned char *' from 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1593:6: warning: assigning to 'const unsigned char *' from 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1680:6: warning: assigning to 'const unsigned char *' from 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1681:6: warning: assigning to 'const unsigned char *' from 'const char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1814:44: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1839:44: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1846:44: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1913:44: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1938:44: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  libMVL.c:1945:44: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
  RlibMVL.c:4232:19: warning: assigning to 'long long *' from 'LIBMVL_OFFSET64 *' (aka 'unsigned long long *') converts between pointers to integer types with different sign [-Wpointer-sign]
  RlibMVL.c:4238:10: warning: assigning to 'long long *' from 'LIBMVL_OFFSET64 *' (aka 'unsigned long long *') converts between pointers to integer types with different sign [-Wpointer-sign]
  RlibMVL.c:4510:47: warning: passing 'char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
See ‘/data/gannet/ripley/R/packages/tests-clang/RMVL.Rcheck/00install.out’ for details.