https://bugs.gentoo.org/970478
https://github.com/rockowitz/ddcutil/commit/a4bc6aef24a2f91f5e5daeb6e1207637ecd55424
From: Sanford Rockowitz <rockowitz@minsoft.com>
Date: Sat, 31 Jan 2026 07:13:26 -0500
Subject: [PATCH] fopen_mkdir(): fix for glibc 2.43

--- a/src/util/file_util.c
+++ b/src/util/file_util.c
@@ -921,13 +921,13 @@ fopen_mkdir(
 
    int rc = 0;
    *fp_loc = NULL;
-   char *sep = strrchr(path, '/');
+   char *path0 = g_strdup(path);
+   char *sep = strrchr(path0, '/');
    if (sep) {
-      char *path0 = g_strdup(path);
-      path0[ sep - path ] = 0;
+      path0[ sep - path0 ] = 0;
       rc = rek_mkdir(path0, ferr);
-      free(path0);
    }
+   g_free(path0);
    if (!rc) {
       *fp_loc = fopen(path,mode);
       if (!*fp_loc) {

https://github.com/rockowitz/ddcutil/commit/a587492200666c6da1bd63dcb35c466a914175bf
From: Sanford Rockowitz <rockowitz@minsoft.com>
Date: Thu, 29 Jan 2026 01:35:09 -0500
Subject: [PATCH] rek_mkdir(): build with glib 2.43

Alternative to change made in pull request #578 that
preserves const-ness of function arg
--- a/src/util/file_util.c
+++ b/src/util/file_util.c
@@ -2,7 +2,7 @@
  *  File utility functions
  */
 
-// Copyright (C) 2014-2024 Sanford Rockowitz <rockowitz@minsoft.com>
+// Copyright (C) 2014-2026 Sanford Rockowitz <rockowitz@minsoft.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 /** \cond */
@@ -890,24 +890,26 @@ int rek_mkdir(
    if (debug)
       printf("(%s) Starting, path=%s\n", __func__, path);
 
+   char * path0 = strdup(path);  // for building on glib 2.43
    int result = 0;
-   if (!directory_exists(path)) {
-      char *sep = strrchr(path, '/');
+   if (!directory_exists(path0)) {
+      char *sep = strrchr(path0, '/');
       if (sep) {
          *sep = 0;
-         result = rek_mkdir(path, ferr);  // create parent dir
+         result = rek_mkdir(path0, ferr);  // create parent dir
          *sep = '/';
       }
       if (result == 0) {
          if (debug)
-            printf("(%s) Creating path %s\n", __func__, path);
-         if ( mkdir(path, 0777) < 0) {
+            printf("(%s) Creating path %s\n", __func__, path0);
+         if ( mkdir(path0, 0777) < 0) {
             result = -errno;
             if (ferr)
-               f0printf(ferr, "Unable to create '%s', %s\n", path, strerror(errno));
+               f0printf(ferr, "Unable to create '%s', %s\n", path0, strerror(errno));
          }
       }
    }
+   free(path0);
 
    if (debug)
       printf("(%s) Done. returning %d\n", __func__, result);

https://github.com/rockowitz/ddcutil/commit/1b1ee00391330db41088db07d1010bd1c20435bb
From: Sanford Rockowitz <rockowitz@minsoft.com>
Date: Wed, 28 Jan 2026 19:40:45 -0500
Subject: [PATCH] extract_number_after_hyphen(): fix build with glibc 2.43

per pull request #578 ReillyBrogan
--- a/src/util/i2c_util.c
+++ b/src/util/i2c_util.c
@@ -3,7 +3,7 @@
  * I2C utility functions
  */
 
-// Copyright (C) 2014-2023 Sanford Rockowitz <rockowitz@minsoft.com>
+// Copyright (C) 2014-2026 Sanford Rockowitz <rockowitz@minsoft.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "config.h"
@@ -60,7 +60,7 @@ int extract_number_after_hyphen(const char * name) {
    int result = -1;
 
    if (name) {
-      char * hyphen = strchr(name, '-');
+      const char * hyphen = strchr(name, '-');
       if (hyphen && *(hyphen+1) != '\0') {
          int ival;
          if ( str_to_int(hyphen+1, &ival, 10) )

https://github.com/rockowitz/ddcutil/commit/b7514d6da709d0c950f8b377aef6e6789dfb1d82
From: Sanford Rockowitz <rockowitz@minsoft.com>
Date: Wed, 28 Jan 2026 19:44:29 -0500
Subject: [PATCH] predicate_exact_D-00hh(): fix build with glibc 2.43

per pull request #578 ReillyBrogan
--- a/src/util/sysfs_filter_functions.c
+++ b/src/util/sysfs_filter_functions.c
@@ -1,6 +1,6 @@
 /** @file sysfs_filter_functions.c */
 
-// Copyright (C) 2021-2025 Sanford Rockowitz <rockowitz@minsoft.com>
+// Copyright (C) 2021-2026 Sanford Rockowitz <rockowitz@minsoft.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <assert.h>
@@ -183,7 +183,7 @@ bool predicate_exact_D_00hh(const char * value, const char * sbusno) {
    bool b1 = compile_and_eval_regex(D_00hh_pattern, value);
    if (b1) {
       // our utilities don't support extracting match groups
-      char * hypos = strchr(value, '-'); // must succeed because of regex match
+      const char * hypos = strchr(value, '-'); // must succeed because of regex match
       char * s = substr(value, 0, (hypos-value));
       b1 = streq(s, sbusno);
       free(s);

https://github.com/rockowitz/ddcutil/commit/23d993829e8107ff9bcf0501a981910f972ba2ab
From: Sanford Rockowitz <rockowitz@minsoft.com>
Date: Thu, 29 Jan 2026 01:26:44 -0500
Subject: [PATCH] hiddev_name_to_number(): build on glib 2.43

Alternative coding of pull request #578,
retains const-ness of function argument
--- a/src/base/displays.c
+++ b/src/base/displays.c
@@ -1625,8 +1625,8 @@ void free_display_handle(Display_Handle * dh) {
  */
 int hiddev_name_to_number(const char * hiddev_name) {
    assert(hiddev_name);
-   char * p = strstr(hiddev_name, "hiddev");
-
+   char * hiddev_name_copy = strdup(hiddev_name);  // for glib 2.43
+   char * p = strstr(hiddev_name_copy, "hiddev");
    int hiddev_number = -1;
    if (p) {
       p = p + strlen("hiddev");
@@ -1638,6 +1638,7 @@ int hiddev_name_to_number(const char * hiddev_name) {
             hiddev_number = -1;   // not necessary, but makes coverity happy
       }
    }
+   free(hiddev_name_copy);
    // DBGMSG("hiddev_name = |%s|, returning: %d", hiddev_name, hiddev_number);
    return hiddev_number;
 }