system/core/libion/include/ion/ion.h:34:35: error: unknown type name 'ion_user_handle_t'
               unsigned int flags, ion_user_handle_t *handle);
                                   ^
system/core/libion/include/ion/ion.h:38:22: error: unknown type name 'ion_user_handle_t'
 int ion_free(int fd, ion_user_handle_t handle);
                      ^
system/core/libion/include/ion/ion.h:39:21: error: unknown type name 'ion_user_handle_t'
 int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot,
                     ^
system/core/libion/include/ion/ion.h:41:23: error: unknown type name 'ion_user_handle_t'
 int ion_share(int fd, ion_user_handle_t handle, int *share_fd);
                       ^
system/core/libion/include/ion/ion.h:42:38: error: unknown type name 'ion_user_handle_t'
 int ion_import(int fd, int share_fd, ion_user_handle_t *handle);
                                      ^
system/core/libion/ion.c:61:35: error: unknown type name 'ion_user_handle_t'
               unsigned int flags, ion_user_handle_t *handle)
                                   ^
system/core/libion/ion.c:81:22: error: unknown type name 'ion_user_handle_t'
 int ion_free(int fd, ion_user_handle_t handle)
                      ^
system/core/libion/ion.c:89:21: error: unknown type name 'ion_user_handle_t'
 int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot,
                     ^
system/core/libion/ion.c:118:23: error: unknown type name 'ion_user_handle_t'
 int ion_share(int fd, ion_user_handle_t handle, int *share_fd)
                       ^
system/core/libion/ion.c: In function 'ion_alloc_fd':
system/core/libion/ion.c:142:5: error: unknown type name 'ion_user_handle_t'
     ion_user_handle_t handle;
     ^
system/core/libion/ion.c:145:5: error: implicit declaration of function 'ion_alloc' [-Werror=implicit-function-declaration]
     ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
     ^
system/core/libion/ion.c:148:5: error: implicit declaration of function 'ion_share' [-Werror=implicit-function-declaration]
     ret = ion_share(fd, handle, handle_fd);
     ^
system/core/libion/ion.c:149:5: error: implicit declaration of function 'ion_free' [-Werror=implicit-function-declaration]
     ion_free(fd, handle);
     ^
system/core/libion/ion.c: At top level:
system/core/libion/ion.c:153:38: error: unknown type name 'ion_user_handle_t'
 int ion_import(int fd, int share_fd, ion_user_handle_t *handle)