+.
+.\"--------------------------------------------------------------------------
+.
+.SH "`%'-ESCAPE SUBSTITUTION"
+.
+If the
+.B \-p
+option is enabled, build commands and arguments are subject to
+.RB ` % '-escape
+substitution before being executed. Certain two-character sequences,
+with the first character
+.RB ` % '
+are replaced with strings, as follows:
+.TP
+.B %a
+The architecture name of the host executing the command.
+.TP
+.B %h
+The hostname of the host executing the command.
+.TP
+.B %P
+The directory prefix with which \*(sw was installed.
+.TP
+.B %p
+The name of the package being built.
+.TP
+.B %v
+The version number of the package being built.
+.TP
+.B %u
+The name of the maintainer of the package being built.
+.TP
+.B %%
+A literal
+.RB ` % '
+character.
+.PP
+Any
+.RB ` % '
+sequences which aren't understood are left as they are.
+.
+.\"--------------------------------------------------------------------------
+.