https://github.com/gphoto/libgphoto2/pull/1235
https://github.com/gphoto/libgphoto2/commit/7cbc8b7241f73835270493d26e440b27060cb3df

From 7cbc8b7241f73835270493d26e440b27060cb3df Mon Sep 17 00:00:00 2001
From: Khem Raj <khem.raj@oss.qualcomm.com>
Date: Sat, 4 Apr 2026 14:56:01 -0700
Subject: [PATCH] libgphoto2: fix const-correctness for c23 builds

C23 treats the return values of strrchr() and strchr() as const char *
when the input string is const-qualified. Update local variables to use
const char * where appropriate to avoid discarded-qualifier warnings and
build failures with -std=gnu23.

No functional change intended.

Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
--- a/camlibs/directory/directory.c
+++ b/camlibs/directory/directory.c
@@ -125,7 +125,7 @@ static const char *
 get_mime_type (const char *filename)
 {
 
-	char *dot;
+	const char *dot;
 	int x=0;
 
 	dot = strrchr(filename, '.');
--- a/libgphoto2/gphoto2-file.c
+++ b/libgphoto2/gphoto2-file.c
@@ -611,7 +611,7 @@ int
 gp_file_open (CameraFile *file, const char *filename)
 {
 	FILE *fp;
-	char *name, *dot;
+	const char *name, *dot;
 	long size, size_read;
 	int  i;
 	struct stat s;
@@ -907,8 +907,8 @@ gp_file_get_name (CameraFile *file, const char **name)
 int
 gp_file_get_name_by_type (CameraFile *file, const char *basename, CameraFileType type, char **newname)
 {
-	char *prefix = NULL, *s, *new, *slash = NULL;
-	const char *suffix = NULL;
+	char *prefix = NULL, *new;
+	const char *suffix = NULL, *s, *slash = NULL;
 	int i;
 
 	C_PARAMS (file && basename && newname);
--- a/libgphoto2/gphoto2-filesys.c
+++ b/libgphoto2/gphoto2-filesys.c
@@ -521,7 +521,7 @@ append_to_folder (CameraFilesystemFolder *folder,
 	CameraFilesystemFolder **newfolder
 ) {
 	CameraFilesystemFolder	*f;
-	char	*s;
+	const char	*s;
 
 	GP_LOG_D ("Append to folder %p/%s - %s", folder, folder->name, foldername);
 	/* Handle multiple slashes, and slashes at the end */
--- a/packaging/generic/print-camera-list.c
+++ b/packaging/generic/print-camera-list.c
@@ -1138,7 +1138,7 @@ escape_html(const char *str) {
 	newstr = malloc(strlen(str)+1+inc);
 	s = str; ns = newstr;
 	do {
-		char *x;
+		const char *x;
 		x = strchr(s,'&');
 		if (x) {
 			memcpy (ns, s, x-s);