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diff --git a/misc/qt5-doc/files/qt.conf.in b/misc/qt5-doc/files/qt.conf.in
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+++ b/misc/qt5-doc/files/qt.conf.in
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+# This file is installed alongside the qmake symlink in
+# ${BUILD_WRKSRC}/qtbase/bin. The qmake binary reads it and overrides some of
+# qmake's built-in properties.
+#
+# qmake's variant properties are not officially documented, so here is
+# a quick explanation:
+# - $$[FOO] refers to the final locations where things are installed. It can be
+#   changed in the Paths section of this file.
+# - $$[FOO]/get refers to locations within a build directory, before the files
+#   are installed into their final location. It can be changed in the
+#   EffectivePaths section.
+# - $$[FOO]/src refers to the source locations of some items (e.g. during a
+#   build, some files are expected to be in the source directory, not the build
+#   directory). It can be configured via the EffectiveSourcePaths entry.
+#
+# In short, we are tricking qmake into behaving as if we had run `configure
+# -developer-build`: all the QT_* and QT_*/get properties point to
+# ${BUILD_WRKSRC}/qtbase and its subdirectories so that this is treated like a
+# developer build (where the installation prefix is the same as the build
+# directory).
+#
+# Additionally, we point QT_INSTALL_DOC/src to the location where the .qdocconf
+# files are installed by the devel/qt5-qdoc-data port.
+
+[EffectivePaths]
+Prefix=%%BUILD_WRKSRC%%/qtbase
+
+[EffectiveSourcePaths]
+Documentation=%%QT_DOCDIR%%
+
+[Paths]
+Prefix=%%BUILD_WRKSRC%%/qtbase