Here is an error I get while regenerating fweb with itself.  ftangle
appears to issue an error in an apparently valid @R decl which it
should most probably not have anything to do with.

$ rm fweave.c
$ make fweave.c
./ftangle ./fweave -uCONFIG -mCONFIG   -mGCC  -=fweave.c
This is FTANGLE [UNIX version 1.61 (September 23, 1998)].
Reading ./fweb.sty...
(No fweave.aux file.)
Reading ./fweave.web... *1 (./typedefs.hweb (./formats.hweb)) (./xrefs.hweb *40) (./tokens.hweb) (./ccodes.hweb) *57 *66
! (FTANGLE):  Invalid `@R' ignored. (l. 1913)
@ Decimal (\.{1.0e-5}) or \FORTRAN\ Hollerith constant (|@R
                                                            3Habc|).
*113 *153 *169 (./scraps.hweb *191) *198 *237 (./output.hweb) *269 *320 *357 *358
Writing the output file(s):  (fweave.c)....500....1000....1500....2000....2500....3000....3500....4000....4500....5000....5500....6000....6500....7000....7500....8000....8500....9000....9500....10000....10500....11000....11500....12000....12500..
Done.
[FTANGLE:  Pardon me, but I think I spotted something wrong.]
make: *** [fweave.c] Error 1

Hi John,

Maybe you remember that I've packaged fweb for Debian GNU/Linux some
time ago.  I don't remember whether I have forwarded to you a couple
of bug reports I got.  You may be interested in them.

One that frequently comes is about the texi documentation that builds
less and less as new versions of makeinfo and texi2html appear.  I
have attempted to fix some problems, for which patches are included in
the Debian package (available from http://packages.debian.org/fweb -
just tell me if you'd like just the relevant fixes)

Others are:

fweave: auto-break of long lines can break fweb's own macros
http://bugs.debian.org/52667

ftangle: barfs on @R in documentation part while generating fweave.c
http://bugs.debian.org/52668

FYI, you can find all bugs reported on the fweb packa at:
http://bugs.debian.org/cgi-bin/pkgreport.cgi?src=fweb


BTW, do you have a new release planned ?

Regards,