include\liblouis\liblouis\metadata.c(242,9): error: call to undeclared library function 'strncasecmp' with type 'int
      (const char *, const char *, unsigned int)'; ISO C99 and later do not support implicit function declarations
      [-Wimplicit-function-declaration]
  242 |         return strncasecmp("language", key, len) == 0 ||
      |                ^
include\liblouis\liblouis\metadata.c(242,9): note: include the header <strings.h> or explicitly provide a declaration
      for 'strncasecmp'