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+IMPLICIT_DEPENDS_INCLUDE_TRANSFORM
+----------------------------------
+
+Specify #include line transforms for dependencies in a directory.
+
+This property specifies rules to transform macro-like #include lines
+during implicit dependency scanning of C and C++ source files.  The
+list of rules must be semicolon-separated with each entry of the form
+"A_MACRO(%)=value-with-%" (the % must be literal).  During dependency
+scanning occurrences of A_MACRO(...) on #include lines will be
+replaced by the value given with the macro argument substituted for
+'%'.  For example, the entry
+
+::
+
+  MYDIR(%)=<mydir/%>
+
+will convert lines of the form
+
+::
+
+  #include MYDIR(myheader.h)
+
+to
+
+::
+
+  #include <mydir/myheader.h>
+
+allowing the dependency to be followed.
+
+This property applies to sources in all targets within a directory.
+The property value is initialized in each directory by its value in
+the directory's parent.