I'm trying to package ndctl:

--8<---------------cut here---------------start------------->8---
(define-public ndctl
  (package
    (name "ndctl")
    (version "60.3")
    (source (origin
              (method git-fetch)
              (uri (git-reference
                    (url "https://github.com/pmem/ndctl")
                    (commit (string-append "v" version))))
              (file-name (string-append name "-" version "-checkout"))
              (sha256
               (base32
                "0w19yh6f9skf5zy4bhdjlrn3wdx5xx9cq8j6h04cmw4nla6zj9ar"))))
    (build-system gnu-build-system)
    (native-inputs
     `(("asciidoc" ,asciidoc)
       ("automake" ,automake)
       ("autocont" ,autoconf)
       ("libtool" ,libtool)
       ("xmlto" ,xmlto)
       ("which" ,which)
       ("pkg-config" ,pkg-config)
       ("docbook-xsl" ,docbook-xsl)
       ("bash-completion" ,bash-completion)))
    (inputs
     `(("json-c" ,json-c)
       ("eudev" ,eudev)
       ("util-linux" ,util-linux)
       ("kmod" ,kmod)))
     (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'autogen
           (lambda _
             (substitute* "autogen.sh"
               (("/bin/sh") (which "sh")))
             (substitute* "git-version-gen"
               (("/bin/sh") (which "sh")))
             (substitute* "git-version"
               (("/bin/bash") (which "bash")))
             (zero? (system* "sh" "autogen.sh")))))))
    (home-page "https://github.com/pmem/ndctl")
    (synopsis "Manage the non-volatile memory device sub-system in the Linux kernel")
    (description
     ;; TODO: Update desc.
     "Utility library for managing the libnvdimm (non-volatile memory device)
sub-system in the Linux kernel.")
    (license license:gpl2+)))
--8<---------------cut here---------------end--------------->8---

It fails to build to documentation:

--8<---------------cut here---------------start------------->8---
starting phase `build'
  GEN      version.m4
make --no-print-directory all-recursive
  GEN      version.m4
Making all in .
  GEN      version.m4
  GEN      rhel/ndctl.spec
  GEN      sles/ndctl.spec
  CC       ccan/str/str.o
  CC       ccan/str/debug.o
  CC       ccan/list/list.o
  CC       util/parse-options.o
  CC       util/usage.o
  CC       util/size.o
  CC       util/main.o
  CC       util/help.o
  CC       util/strbuf.o
  CC       util/wrapper.o
  CC       util/filter.o
  CC       util/bitmap.o
  AR       libccan.a
ar: `u' modifier ignored since `D' is the default (see `U')
  AR       libutil.a
ar: `u' modifier ignored since `D' is the default (see `U')
Making all in daxctl/lib
  CC       ../../util/sysfs.lo
  CC       ../../util/log.lo
  CC       libdaxctl.lo
  GEN      libdaxctl.pc
  CCLD     libdaxctl.la
Making all in ndctl/lib
  CC       nfit.lo
  CC       dimm.lo
  CC       smart.lo
  CC       inject.lo
  CC       intel.lo
  CC       hpe1.lo
  CC       msft.lo
  CC       ars.lo
  CC       firmware.lo
  CC       libndctl.lo
  GEN      libndctl.pc
  CCLD     libndctl.la
Making all in ndctl
  CC       ndctl.o
  CC       create-nfit.o
  CC       namespace.o
  CC       bus.o
  CC       check.o
  CC       region.o
  CC       dimm.o
  CC       ../util/log.o
  CC       list.o
  CC       test.o
  CC       ../util/json.o
  CC       inject-error.o
  CC       inject-smart.o
  CC       util/json-smart.o
  CC       util/json-firmware.o
  CCLD     ndctl
Making all in daxctl
  CC       daxctl.o
  CC       list.o
  CC       ../util/json.o
  CCLD     daxctl
Making all in Documentation/ndctl
  GEN      asciidoc.conf
  GEN      ndctl.xml
  GEN      ndctl-wait-scrub.xml
  GEN      ndctl-start-scrub.xml
  GEN      ndctl-zero-labels.xml
  GEN      ndctl-read-labels.xml
  GEN      ndctl-write-labels.xml
  GEN      ndctl-init-labels.xml
  GEN      ndctl-check-labels.xml
  GEN      ndctl-enable-region.xml
  GEN      ndctl-disable-region.xml
  GEN      ndctl-enable-dimm.xml
  GEN      ndctl-disable-dimm.xml
  GEN      ndctl-enable-namespace.xml
  GEN      ndctl-disable-namespace.xml
  GEN      ndctl-create-namespace.xml
  GEN      ndctl-destroy-namespace.xml
  GEN      ndctl-check-namespace.xml
  GEN      ndctl-inject-error.xml
  GEN      ndctl-inject-smart.xml
  GEN      ndctl-update-firmware.xml
  GEN      ndctl-list.xml
  GEN      ndctl.1
  GEN      ndctl-wait-scrub.1
I/O error : Attempt to load network entity http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"
compilation error: file /tmp/guix-build-ndctl-60.3.drv-0/xmlto-xsl.BtfqIT line 4 element import
xsl:import : unable to load http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
make[2]: *** [Makefile:591: ndctl.1] Error 5
make[2]: *** Waiting for unfinished jobs....
  GEN      ndctl-start-scrub.1
I/O error : Attempt to load network entity http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"
compilation error: file /tmp/guix-build-ndctl-60.3.drv-0/xmlto-xsl.qLWSqR line 4 element import
xsl:import : unable to load http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
make[2]: *** [Makefile:591: ndctl-wait-scrub.1] Error 5
I/O error : Attempt to load network entity http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"
compilation error: file /tmp/guix-build-ndctl-60.3.drv-0/xmlto-xsl.1OgxRr line 4 element import
xsl:import : unable to load http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
make[2]: *** [Makefile:591: ndctl-start-scrub.1] Error 5
rm ndctl-check-labels.xml ndctl-init-labels.xml ndctl-list.xml ndctl-wait-scrub.xml ndctl-enable-dimm.xml ndctl-zero-labels.xml ndctl-check-namespace.xml ndctl-inject-error.xml ndctl-write-labels.xml ndctl-inject-smart.xml ndctl-enable-namespace.xml ndctl-read-labels.xml ndctl-destroy-namespace.xml ndctl.xml ndctl-disable-region.xml ndctl-disable-namespace.xml ndctl-start-scrub.xml ndctl-disable-dimm.xml ndctl-create-namespace.xml ndctl-enable-region.xml ndctl-update-firmware.xml
make[1]: *** [Makefile:742: all-recursive] Error 1
make: *** [Makefile:526: all] Error 2
phase `build' failed after 7.4 seconds
note: keeping build directory `/tmp/guix-build-ndctl-60.3.drv-10'
builder for `/gnu/store/h37pwmlshy70a382wb9f7riis03v1cgy-ndctl-60.3.drv' failed with exit code 1
@ build-failed /gnu/store/h37pwmlshy70a382wb9f7riis03v1cgy-ndctl-60.3.drv - 1 builder for `/gnu/store/h37pwmlshy70a382wb9f7riis03v1cgy-ndctl-60.3.drv' failed with exit code 1
guix build: error: build failed: build of `/gnu/store/h37pwmlshy70a382wb9f7riis03v1cgy-ndctl-60.3.drv' failed
--8<---------------cut here---------------end--------------->8---

I cannot find a reference to

	http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl

in the source code. (Or did I miss it?)

The "asciidoc" Guix package is patched so that it uses local docbook-xsl
instead of fetching the imports from the Internet.

xmlto, however, has the following file:

	/gnu/store/6932n73qc695c43fhqm1w213z65n7b7k-xmlto-0.0.28/share/xmlto/format/docbook/man

which content is

--8<---------------cut here---------------start------------->8---
case "$1" in
stylesheet)
  if [ "$VERBOSE" -ge 1 ]
  then
    echo >&2 "Convert to troff"
  fi
  echo "http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"
  ;;
post-process)
  [ -e "$XSLT_PROCESSED" ] && rm "$XSLT_PROCESSED"
  ${GCP_PATH:-cp} -R -P -p -- * "$OUTPUT_DIR" 2>/dev/null
  ;;
esac
--8<---------------cut here---------------end--------------->8---

I think that "echo" line should be patched just like docbook.  What do
you think?

--
Pierre Neidhardt