diff --git a/NEWS b/NEWS
index 78bca780f27..e8c254222b4 100644
--- a/NEWS
+++ b/NEWS
@@ -31,6 +31,10 @@ PHP                                                                        NEWS
 - PHPDBG:
   . Fixed bug GH-12675 (MEMORY_LEAK in phpdbg_prompt.c). (nielsdos)
 
+- POSIX:
+  . Fixed bug GH-12725 (Call to undefined function posix_fpathconf() in default
+    configure setting). (petk)
+
 - SPL:
   . Fixed bug GH-12721 (SplFileInfo::getFilename() segfault in combination
     with GlobIterator and no directory separator). (nielsdos)
diff --git a/ext/posix/config.m4 b/ext/posix/config.m4
index 6b056c43740..ff4a421542d 100644
--- a/ext/posix/config.m4
+++ b/ext/posix/config.m4
@@ -10,7 +10,12 @@ if test "$PHP_POSIX" = "yes"; then
 
   AC_CHECK_HEADERS([sys/mkdev.h sys/sysmacros.h])
 
-  AC_CHECK_FUNCS(seteuid setegid setsid getsid getpgid ctermid mkfifo mknod setrlimit getrlimit getgroups makedev initgroups getgrgid_r posix_pathconf eaccess)
+  AC_CHECK_FUNCS(seteuid setegid setsid getsid getpgid ctermid mkfifo mknod setrlimit getrlimit getgroups makedev initgroups getgrgid_r eaccess)
+
+dnl Skip pathconf and fpathconf check on musl libc due to limited implementation
+dnl (first argument is not validated and has different error).
+  AS_IF([command -v ldd >/dev/null && ldd --version 2>&1 | grep -q "^musl"],[],
+    [AC_CHECK_FUNCS(pathconf fpathconf)])
 
   AC_MSG_CHECKING([for working ttyname_r() implementation])
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index 068c168634e..8c111ea5acf 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -533,8 +533,8 @@ PHP_FUNCTION(posix_isatty)
 /* }}} */
 
 /*
-	POSIX.1, 4.8.1 sysconf() - TODO
-	POSIX.1, 5.7.1 pathconf(), fpathconf() - TODO
+	POSIX.1, 4.8.1 sysconf()
+	POSIX.1, 5.7.1 pathconf(), fpathconf()
 
 	POSIX.1, 5.1.2 opendir(), readdir(), rewinddir(), closedir()
 	POSIX.1, 5.2.1 chdir()
@@ -1240,7 +1240,7 @@ PHP_FUNCTION(posix_sysconf)
 	RETURN_LONG(sysconf(conf_id));
 }
 
-#ifdef HAVE_POSIX_PATHCONF
+#ifdef HAVE_PATHCONF
 PHP_FUNCTION(posix_pathconf)
 {
 	zend_long name, ret;
@@ -1269,7 +1269,9 @@ PHP_FUNCTION(posix_pathconf)
 
 	RETURN_LONG(ret);
 }
+#endif
 
+#ifdef HAVE_FPATHCONF
 PHP_FUNCTION(posix_fpathconf)
 {
 	zend_long name, ret, fd = 0;
diff --git a/ext/posix/posix.stub.php b/ext/posix/posix.stub.php
index 4e5adc2eef9..4fc0278d842 100644
--- a/ext/posix/posix.stub.php
+++ b/ext/posix/posix.stub.php
@@ -432,8 +432,11 @@ function posix_initgroups(string $username, int $group_id): bool {}
 
 function posix_sysconf(int $conf_id): int {}
 
-#ifdef HAVE_POSIX_PATHCONF
+#ifdef HAVE_PATHCONF
 function posix_pathconf(string $path, int $name): int|false {}
+#endif
+
+#ifdef HAVE_FPATHCONF
 /** @param resource|int $file_descriptor */
 function posix_fpathconf($file_descriptor, int $name): int|false {}
 #endif
diff --git a/ext/posix/posix_arginfo.h b/ext/posix/posix_arginfo.h
index 2953e93fcdd..fd789c4c9ff 100644
--- a/ext/posix/posix_arginfo.h
+++ b/ext/posix/posix_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 5a4a863892761475f2d34d9463e0660b0a8ede5d */
+ * Stub hash: 372ab42a8aebd30ac41f4219d87a5ef6e8b03b24 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_posix_kill, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, process_id, IS_LONG, 0)
@@ -171,14 +171,14 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_posix_sysconf, 0, 1, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO(0, conf_id, IS_LONG, 0)
 ZEND_END_ARG_INFO()
 
-#if defined(HAVE_POSIX_PATHCONF)
+#if defined(HAVE_PATHCONF)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_posix_pathconf, 0, 2, MAY_BE_LONG|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, path, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, name, IS_LONG, 0)
 ZEND_END_ARG_INFO()
 #endif
 
-#if defined(HAVE_POSIX_PATHCONF)
+#if defined(HAVE_FPATHCONF)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_posix_fpathconf, 0, 2, MAY_BE_LONG|MAY_BE_FALSE)
 	ZEND_ARG_INFO(0, file_descriptor)
 	ZEND_ARG_TYPE_INFO(0, name, IS_LONG, 0)
@@ -252,10 +252,10 @@ ZEND_FUNCTION(posix_strerror);
 ZEND_FUNCTION(posix_initgroups);
 #endif
 ZEND_FUNCTION(posix_sysconf);
-#if defined(HAVE_POSIX_PATHCONF)
+#if defined(HAVE_PATHCONF)
 ZEND_FUNCTION(posix_pathconf);
 #endif
-#if defined(HAVE_POSIX_PATHCONF)
+#if defined(HAVE_FPATHCONF)
 ZEND_FUNCTION(posix_fpathconf);
 #endif
 
@@ -328,10 +328,10 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_FE(posix_initgroups, arginfo_posix_initgroups)
 #endif
 	ZEND_FE(posix_sysconf, arginfo_posix_sysconf)
-#if defined(HAVE_POSIX_PATHCONF)
+#if defined(HAVE_PATHCONF)
 	ZEND_FE(posix_pathconf, arginfo_posix_pathconf)
 #endif
-#if defined(HAVE_POSIX_PATHCONF)
+#if defined(HAVE_FPATHCONF)
 	ZEND_FE(posix_fpathconf, arginfo_posix_fpathconf)
 #endif
 	ZEND_FE_END