--- proftpd-1.3.8c/modules/mod_auth_pam.c.~1~	2024-12-11 13:17:36.000000000 -0500
+++ proftpd-1.3.8c/modules/mod_auth_pam.c	2025-01-02 16:27:06.125287079 -0500
@@ -82,7 +82,7 @@
  * const, but on Solaris, it isn't.  To avoid compiler warnings about
  * incompatible pointer types, we need to use const or not as appropriate.
  */
-#ifndef SOLARIS2
+#if !defined(SOLARIS2) || ( defined(__illumos__) && !defined(_PAM_LEGACY_NONCONST) )
 # define PR_PAM_CONST	const
 #else
 # define PR_PAM_CONST