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+This document helps package maintainers write `Build-Depends` fields
+that ensure that the installed version of opkbuild supports features
+needed by a source package. Read this document from top to bottom, and
+as soon as you find a criterion that applies to your source package, you
+can add the specified versioned build dependency and stop reading.
+
+Add `opkbuild (>= 4.2.2+dev)` to your `Build-Depends` if...
+
+ * Your binary packages don't list in their `Depends` fields the binary
+ package that provides source package documentation.
+ * Your ProteanOS source package version contains an epoch, e.g.
+ `1:2.0-1`.
+ * Any two or more of your binary packages would have the same name if
+ all characters except letters and numbers were removed, e.g.
+ `libc-1` and `libc++.1`.
+
+Add `opkbuild (>= 4.2.2)` to your `Build-Depends` if...
+
+ * Any of your substitution variables are used in binary package
+ dependency fields and contain dependency restrictions or newline
+ characters. This is common for example in platform configuration
+ source packages that use `platconf-pkg-tools` which generates binary
+ package control files that get `Depends` field values from
+ substitution variables.
+
+Add `opkbuild (>= 4.2.1)` to your `Build-Depends` if...
+
+ * Your `Build-Depends` field contains newline characters.
+
+Add `opkbuild (>= 4.2.0)` to your `Build-Depends` if...
+
+ * Any of your binary packages has a `Section` field.
+
+Add `opkbuild (>= 4.1.4)` to your `Build-Depends` if...
+
+ * Your ProteanOS source package version indicates an upload of a new
+ upstream version to a non-trunk distribution (e.g. version
+ `2019a-0+rs1~1`) or an upload of a backport to a non-trunk
+ distribution (e.g. version `3.0-2+bpu1+1`).
+
+Add `opkbuild (>= 4.0.2)` to your `Build-Depends` if...
+
+ * Your ProteanOS source package upstream version contains a plus sign,
+ e.g. `1.4+git20141115.146bff1-1`.
+
+Add `opkbuild (>= 4.0.1)` to your `Build-Depends` if...
+
+ * You use binary package substitution variables files in the build
+ work area, e.g. with opkhelper's oh-shlibdeps utility. If you use
+ oh-shlibdeps on ProteanOS, you should also add
+ `opkhelper-3.0 (>= 3.1.4)` to your `Build-Depends`.
+
+Add `opkbuild (>= 4.0.0)` to your `Build-Depends` if...
+
+ * Your upstream source archive is compressed using xz.
+
+Copyright Information
+---------------------
+
+Copyright (C) 2023 Patrick McDermott
+
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved. This file is offered as-is,
+without any warranty.