Switch the 5 nested children (scmos/cif_template, doc/man, doc/tutcells,
doc/html, doc/latexfiles) to configure-provided substitution:
srcdir = @srcdir@
VPATH = @srcdir@
MAGICDIR = @top_builddir@ (resolves to ../.. for these nested dirs)
Verified out-of-tree: full `make` rc=0; cif_template gets
srcdir=<src>/scmos/cif_template, doc/latexfiles MAGICDIR=../..; scmos
techs + 27/28 docs build.
With this, every module except readline/ is a configure-generated
Makefile.in using @srcdir@ substitution.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>