fs/open.c:955:23: error: call to undeclared function 'real_mount'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
fs/open.c:955:17: error: incompatible integer to pointer conversion initializing 'struct mount *' with an expression of type 'int' [-Wint-conversion]
fs/open.c:957:10: error: incomplete definition of type 'struct mount'
fs/open.c:959:7: error: call to undeclared function 'mnt_get_count'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]