gnu: drbd-utils: Enable building on more architectures.

* gnu/packages/cluster.scm (drbd-utils)[arguments]: Only generate the
man-pages on systems which support ruby-asciidoctor.
[native-inputs]: Only include docbook-xml, docbook-xml-4.4, docbook-xsl,
libxml2, libxslt, ruby-asciidoctor on systems which support
ruby-asciidoctor.

Change-Id: I7d45a1fbcb87d3847dfd49b4efdb80961f1f6a22

gnu/packages/cluster.scm

@@ -4,6 +4,7 @@
 ;;; Copyright © 2019 Andrew Miloradovsky <andrew@interpretmath.pw>
 ;;; Copyright © 2020, 2022 Marius Bakke <marius@gnu.org>
 ;;; Copyright © 2021 Dion Mendel <guix@dm9.info>
+;;; Copyright © 2023 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -74,7 +75,8 @@
     (arguments
      (list
       #:configure-flags
-      #~(list "--sysconfdir=/etc"
+      #~(append
+          (list "--sysconfdir=/etc"
                 "--localstatedir=/var"
                 ;; Do not install sysv or systemd init scripts.
                 "--with-initscripttype=none"
@@ -82,6 +84,9 @@
                 ;; Linux-Libre versions < 3.8.  8.4 is the latest
                 ;; kernel driver as of Linux 5.18.
                 "--without-83support")
+          #$(if (this-package-native-input "ruby-asciidoctor")
+               #~'()
+               #~(list "--without-manual")))
       #:test-target "test"
       #:make-flags #~(list "WANT_DRBD_REPRODUCIBLE_BUILD=yesplease")
       #:phases
@@ -126,16 +131,18 @@
                 (("\\$\\(DESTDIR\\)\\$\\(DRBD_LIB_DIR\\)")
                  "$(DESTDIR)$(prefix)$(DRBD_LIB_DIR)")))))))
     (native-inputs
-     (list clitest
+     (append (list clitest
                    eudev                        ;just to satisfy a configure check
-           flex
+                   flex)
              ;; For the documentation.
-           docbook-xml
+             (if (supported-package? ruby-asciidoctor)
+               (list docbook-xml
                      docbook-xml-4.4            ;used by documentation/ra2refentry.xsl
                      docbook-xsl
                      libxml2                    ;for XML_CATALOG_FILES
                      libxslt                    ;for xsltproc
-           ruby-asciidoctor))
+                     ruby-asciidoctor)
+               '())))
     (home-page "https://www.linbit.com/drbd/")
     (synopsis "Replicate block devices between machines")
     (description