diff --git a/lib/zip_mkstempm.c b/lib/zip_mkstempm.c
deleted file mode 100644
index 4efcf79..0000000
--- a/lib/zip_mkstempm.c
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
-  zip_mkstempm.c -- mkstemp replacement that accepts a mode argument
-  Copyright (C) 2019-2021 Dieter Baron and Thomas Klausner
-
-  This file is part of libzip, a library to manipulate ZIP archives.
-  The authors can be contacted at <libzip@nih.at>
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-  2. Redistributions in binary form must reproduce the above copyright
-     notice, this list of conditions and the following disclaimer in
-     the documentation and/or other materials provided with the
-     distribution.
-  3. The names of the authors may not be used to endorse or promote
-     products derived from this software without specific prior
-     written permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-#include <errno.h>
-#include <fcntl.h>
-#include <string.h>
-#include <sys/stat.h>
-
-#include "zipint.h"
-
-/*
- * create temporary file with same permissions as previous one;
- * or default permissions if there is no previous file
- */
-int
-_zip_mkstempm(char *path, int mode, bool create_file) {
-    int fd;
-    char *start, *end, *xs;
-
-    int xcnt = 0;
-
-    end = path + strlen(path) - 1;
-    while (end >= path) {
-        if (*end == 'X') {
-            break;
-        }
-        end--;
-    }
-    if (end < path) {
-        errno = EINVAL;
-        return -1;
-    }
-    start = end;
-    while (start >= path && *start == 'X') {
-        xcnt++;
-        start--;
-    }
-    start++;
-
-    for (;;) {
-        zip_uint32_t value = zip_random_uint32();
-
-        xs = start;
-
-        while (xs <= end) {
-            char digit = value % 36;
-            if (digit < 10) {
-                *(xs++) = digit + '0';
-            }
-            else {
-                *(xs++) = digit - 10 + 'a';
-            }
-            value /= 36;
-        }
-
-        if (create_file) {
-            if ((fd = open(path, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC, mode == -1 ? 0666 : (mode_t)mode)) >= 0) {
-                if (mode != -1) {
-                    /* open() honors umask(), which we don't want in this case */
-#ifdef HAVE_FCHMOD
-                    (void)fchmod(fd, (mode_t)mode);
-#else
-                    (void)chmod(path, (mode_t)mode);
-                }
-#endif
-                return fd;
-            }
-            if (errno != EEXIST) {
-                return -1;
-            }
-        }
-        else {
-            struct stat st;
-            
-            if (stat(path, &st) < 0) {
-                if (errno == ENOENT) {
-                    return 0;
-                }
-                else {
-                    return -1;
-                }
-            }
-        }
-    }
-}