--- /dev/null
+From 16a1647fc26953fab659de5f55d4c0defdfb894f Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sat, 22 Mar 2025 17:56:19 -0700
+Subject: [PATCH] getopt: Fix signature of getenv function
+
+This happens on musl systems using GCC 15
+
+../which-2.21/getopt.h:106:12: error: conflicting types for 'getopt'; have 'int(void)'
+ 106 | extern int getopt ();
+ | ^~~~~~
+
+Upstream-Status: Submitted [https://lists.gnu.org/archive/html/which-bugs/2025-03/msg00000.html]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ getopt.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/getopt.c
++++ b/getopt.c
+@@ -209,7 +209,7 @@ static char *posixly_correct;
+ /* Avoid depending on library functions or files
+ whose names are inconsistent. */
+
+-char *getenv ();
++char *getenv (const char*);
+
+ static char *
+ my_index (str, chr)
+--- a/getopt.h
++++ b/getopt.h
+@@ -103,7 +103,7 @@ struct option
+ errors, only prototype getopt for the GNU C library. */
+ extern int getopt (int argc, char *const *argv, const char *shortopts);
+ #else /* not __GNU_LIBRARY__ */
+-extern int getopt ();
++extern int getopt (int, char * const [], const char *);
+ #endif /* __GNU_LIBRARY__ */
+ extern int getopt_long (int argc, char *const *argv, const char *shortopts,
+ const struct option *longopts, int *longind);