https://bugs.gentoo.org/861860
--- a/src/hashkit/nc_hashkit.h
+++ b/src/hashkit/nc_hashkit.h
@@ -55,7 +55,7 @@ typedef enum dist_type {
 #undef DEFINE_ACTION
 
 uint32_t hash_one_at_a_time(const char *key, size_t key_length);
-void md5_signature(const unsigned char *key, unsigned int length, unsigned char *result);
+void md5_signature(const unsigned char *key, unsigned long length, unsigned char *result);
 uint32_t hash_md5(const char *key, size_t key_length);
 uint32_t hash_crc16(const char *key, size_t key_length);
 uint32_t hash_crc32(const char *key, size_t key_length);