diff -uNr drbd-utils-9.12.2.orig/documentation/common/Makefile_v84_com.in drbd-utils-9.12.2/documentation/common/Makefile_v84_com.in
--- drbd-utils-9.12.2.orig/documentation/common/Makefile_v84_com.in	2019-01-21 12:32:29.000000000 +0100
+++ drbd-utils-9.12.2/documentation/common/Makefile_v84_com.in	2020-04-29 11:22:52.049000000 +0200
@@ -50,7 +50,7 @@
 HTML_STYLESHEET ?= $(STYLESHEET_PREFIX)/xhtml/docbook.xsl
 FO_STYLESHEET ?= $(STYLESHEET_PREFIX)/fo/docbook.xsl
 
-XSLTPROC_OPTIONS ?= --xinclude
+XSLTPROC_OPTIONS ?= --nonet --xinclude
 XSLTPROC_OPTIONS += --stringparam variablelist.term.break.after 1
 #XSLTPROC_OPTIONS += --stringparam variablelist.term.separator ""
 XSLTPROC_MANPAGES_OPTIONS ?= $(XSLTPROC_OPTIONS)
diff -uNr drbd-utils-9.12.2.orig/documentation/common/Makefile_v9_com.in drbd-utils-9.12.2/documentation/common/Makefile_v9_com.in
--- drbd-utils-9.12.2.orig/documentation/common/Makefile_v9_com.in	2020-01-28 09:39:54.000000000 +0100
+++ drbd-utils-9.12.2/documentation/common/Makefile_v9_com.in	2020-04-29 11:22:44.521000000 +0200
@@ -51,7 +51,7 @@
 HTML_STYLESHEET ?= $(STYLESHEET_PREFIX)/xhtml/docbook.xsl
 FO_STYLESHEET ?= $(STYLESHEET_PREFIX)/fo/docbook.xsl
 
-XSLTPROC_OPTIONS ?= --xinclude
+XSLTPROC_OPTIONS ?= --nonet --xinclude
 XSLTPROC_OPTIONS += --stringparam variablelist.term.break.after 1
 #XSLTPROC_OPTIONS += --stringparam variablelist.term.separator ""
 XSLTPROC_MANPAGES_OPTIONS ?= $(XSLTPROC_OPTIONS)