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+How change files are applied for pdftex/pdfetex?
+
+============================= pdftex =============================
+
+2) pdftex.ch is generated from
+ ./tie -c pdftex.ch pdftex.web \
+ $(srcdir)/pdftexdir/tex.ch0 \
+ $(srcdir)/tex.ch \
+ $(srcdir)/pdftexdir/tex.ch1 \
+ $(srcdir)/pdftexdir/tex.pch
+
+Input:
+ pdftex.web:
+ pdftex without system-dependent changes
+
+ pdftexdir/tex.ch0:
+ % Change file to assist in creating the web2c-specific change file.
+ % This one comes first, resolves inconsistencies between the
+ % generated pdftex.web and tex.ch
+
+ change the pdftex banner to tex banner, so tex.ch can be applied
+
+ tex.ch:
+ the main web2c-specific (or other system-dependent) change file
+
+ pdftexdir/pdftex.ch:
+
+ % Change file to assist in creating the web2c-specific change file.
+ % This one resolves inconsistencies between tex.ch and tex.pch.
+
+ change the tex banner to pdftex banner (reverse tex.ch0)
+
+Output:
+ pdftex.ch (not pdftexdir/pdftex.ch):
+ additional & system-dependent changes