gutenprint/gutenprint-postscriptdriver.patch

diff -up gutenprint-5.3.3/src/main/gutenprint-internal.h.postscriptdriver gutenprint-5.3.3/src/main/gutenprint-internal.h
--- gutenprint-5.3.3/src/main/gutenprint-internal.h.postscriptdriver	2018-01-28 03:32:45.000000000 +0100
+++ gutenprint-5.3.3/src/main/gutenprint-internal.h	2019-11-06 12:13:29.936061606 +0100
@@ -54,6 +54,8 @@ extern void stpi_init_printer(void);
 #define BUFFER_FLAG_FLIP_X	0x1
 #define BUFFER_FLAG_FLIP_Y	0x2
 extern stp_image_t* stpi_buffer_image(stp_image_t* image, unsigned int flags);
+extern stp_list_t *stp_paths_copy_with_prefix(stp_list_t* list,
+					      const char *prefix);
 
 #define STPI_ASSERT(x,v)						\
 do									\
diff -up gutenprint-5.3.3/src/main/module.c.postscriptdriver gutenprint-5.3.3/src/main/module.c
--- gutenprint-5.3.3/src/main/module.c.postscriptdriver	2019-05-25 16:34:21.000000000 +0200
+++ gutenprint-5.3.3/src/main/module.c	2019-11-06 12:13:29.936061606 +0100
@@ -159,12 +159,20 @@ int stp_module_load(void)
     }
   else
     {
+      const char *prefix = getenv("DESTDIR");
 #ifdef USE_LTDL
       stp_path_split(dir_list, getenv("LTDL_LIBRARY_PATH"));
       stp_path_split(dir_list, lt_dlgetsearchpath());
 #else
       stp_path_split(dir_list, PKGMODULEDIR);
 #endif
+      if (prefix)
+	{
+	  stp_list_t *prefix_list;
+	  prefix_list = stp_paths_copy_with_prefix(dir_list, prefix);
+	  stp_list_destroy(dir_list);
+	  dir_list = prefix_list;
+	}
     }
 #ifdef USE_LTDL
   file_list = stp_path_search(dir_list, ".la");
diff -up gutenprint-5.3.3/src/main/path.c.postscriptdriver gutenprint-5.3.3/src/main/path.c
--- gutenprint-5.3.3/src/main/path.c.postscriptdriver	2019-05-25 16:34:21.000000000 +0200
+++ gutenprint-5.3.3/src/main/path.c	2019-11-06 12:29:30.709190171 +0100
@@ -154,6 +154,17 @@ stp_generate_path(const char *path)
     return NULL;
   stp_list_set_freefunc(dir_list, stp_list_node_free_data);
   stp_path_split(dir_list, path);
+  if (!strncmp(PKGXMLDATADIR, path, strlen(path)))
+  {
+    const char *prefix = getenv("DESTDIR");
+    if (prefix)
+    {
+      stp_list_t *prefix_list;
+      prefix_list = stp_paths_copy_with_prefix(dir_list, prefix);
+      stp_list_destroy(dir_list);
+      dir_list = prefix_list;
+    }
+  }
   return dir_list;
 }
 
@@ -262,6 +273,40 @@ stp_path_split(stp_list_t *list, /* List
     }
 }
 
+/*
+ * Split a PATH-type string (colon-delimited) into separate
+ * directories.
+ */
+stp_list_t *
+stp_paths_copy_with_prefix(stp_list_t *list,   /* List to add prefix to */
+			   const char *prefix) /* Prefix to add */
+{
+  stp_list_t *new_list;
+  stp_list_item_t *item;
+  int prefixlen = strlen (prefix);
+  if (!(new_list = stp_list_create()))
+    return NULL;
+
+  item = stp_list_get_start (list);
+  while (item)
+    {
+      const char *data;
+      char *new_data;
+      int len;
+      data = stp_list_item_get_data (item);
+      len = strlen (data);
+      new_data = (char *) stp_malloc(prefixlen + 1 + len + 1);
+      strncpy(new_data, prefix, prefixlen);
+      new_data[prefixlen] = '/';
+      strcpy(new_data + prefixlen + 1, data);
+      stp_list_item_create(new_list, NULL, new_data);
+
+      item = stp_list_item_next (item);
+    }
+
+  return new_list;
+}
+
 /* Adapted from GNU libc <dirent.h>
    These macros extract size information from a `struct dirent *'.
    They may evaluate their argument multiple times, so it must not