+ (add-after 'unpack 'disable-relocatability
+ (lambda _
+ ;; Groff contains a Rube Goldberg-esque relocator for the file
+ ;; "charset.alias". It tries to find the current executable
+ ;; using realpath, a do-it-yourself search in $PATH and so on.
+ ;; Furthermore, the routine that does the search is buggy
+ ;; in that it doesn't handle error cases when they arise.
+ ;; This causes preconv to segfault when trying to look up
+ ;; the file "charset.alias" in the NULL location.
+ ;; The "charset.alias" parser is a copy of gnulib's, and a
+ ;; non-broken version of gnulib's "charset.alias" parser is
+ ;; part of glibc's libcharset.
+ ;; However, groff unconditionally uses their own
+ ;; "charset.alias" parser, but then DOES NOT INSTALL the
+ ;; file "charset.alias" when glibc is too new.
+ ;; In Guix, our file "charset.alias" only contains an obscure
+ ;; alias for ASCII and nothing else. So just disable relocation
+ ;; and make the entire "charset.alias" lookup fail.
+ ;; See <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30785> for
+ ;; details.
+ (substitute* "Makefile.in"
+ (("-DENABLE_RELOCATABLE=1") ""))
+ #t))