diff -urNp -x '*.orig' Crypt-RIPEMD160-0.06.org/rmd160.h Crypt-RIPEMD160-0.06/rmd160.h
--- Crypt-RIPEMD160-0.06.org/rmd160.h	2011-04-11 04:12:20.000000000 +0200
+++ Crypt-RIPEMD160-0.06/rmd160.h	2021-05-07 23:15:17.914178160 +0200
@@ -20,12 +20,13 @@
 
 /********************************************************************/
 
+#include <stdint.h>
 /* typedef 8, 16 and 32 bit types, resp.  */
 /* adapt these, if necessary, 
    for your operating system and compiler */
-typedef    unsigned char        byte; /* unsigned 8-bit integer */
-typedef    unsigned short       word; /* unsigned 16-bit integer */
-typedef    unsigned int        dword; /* unsigned 32-bit integer */ 
+typedef    uint8_t        byte;   /* unsigned 8-bit integer */
+typedef    uint16_t       word;   /* unsigned 16-bit integer */
+typedef    uint32_t       dword;  /* unsigned 32-bit integer */ 
 
 /********************************************************************/