libgcrypt 1.8.2 is not reproducible on GNU Guix (and on Debian also).
The reason is that yat2m does not respect SOURCE_DATE_EPOCH and includes a build-time timestamp in the created man-page.
I found out that bug entry 5494a5728418 fixed that problem already for libgpg-error.
I created a patch via:
diff -u libgcrypt-1.8.3/doc/yat2m.c gnupg-2.2.9/doc/yat2m.c
That patch contains slightly more than just the timestamp patch.
From the comments it looks like this should also be synced, but
I'm not fully sure. Thus I created a simple trimmed patch for GNU Guix.