--- /dev/null
+#!/bin/sh
+
+candidate="$1" #ignored
+
+asciidoc=`which asciidoc`
+if [ ! -x "$asciidoc" ]; then
+ # echo nothing: no suitable asciidoc found
+ exit 1
+fi
+
+# Output of 'asciidoc --version' examples:
+# asciidoc 8.6.7
+version=`$asciidoc --version | cut -d\ -f2`
+major=`echo "$version" | cut -d. -f1`
+minor=`echo "$version" | cut -d. -f2`
+bugfix=`echo "$version" | cut -d. -f3`
+
+# To generate the manual, we need asciidoc >= 8.6.3
+major_min=8
+minor_min=6
+bugfix_min=3
+if [ $major -gt $major_min ]; then
+ echo $asciidoc
+else
+ if [ $major -eq $major_min -a $minor -ge $minor_min ]; then
+ echo $asciidoc
+ else
+ if [ $major -eq $major_min -a $minor -eq $minor_min \
+ -a $bugfix -ge $bugfix_min ]; then
+ echo $asciidoc
+ else
+ # echo nothing: no suitable asciidoc found
+ exit 1
+ fi
+ fi
+fi