It was not Redhat who changed the SLang API of SLsmg_write_char, but

actually Debian. Redhat only copied that code.

src/tty.c

@@ -117,8 +117,8 @@ extern void
 tty_print_char(int c)
 {
 #ifdef HAVE_SLANG
-    /* We cannot use SLsmg_write_char here because the Redhat people
-     * thought changing the API of an external project was fun,
+    /* We cannot use SLsmg_write_char here because the Debian and Redhat
+     * people thought changing the API of an external project was fun,
      * especially when it depends on the preprocessor symbol UTF8 being
      * defined or not. Congratulations! At least, they left the API call
      * for SLsmg_write_nchars as it has always been.