configure: Make missing docbook2man an error if man build requested

Previously, if man page build was enabled but no suitable docbook2man or
the like tool was found, build failed at a later stage with
undescriptive error message. Fail early and explicitly at configure
stage instead.

Signed-off-by: Ville Skyttä <ville.skytta@iki.fi>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/configure.ac b/configure.ac
index 3b8ff96fb531af0b21542c32e8a73bba503947c1..1a386535ed8b0ad125db60f851f80eeb15615fac 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -73,7 +73,7 @@ AM_COND_IF([BUILD_MAN], [
              [AS_IF([test "$DOCBOOK2MAN" != "no"], [DB2MAN="$DOCBOOK2MAN"],
                     [AS_IF([test "$DB2X_DOCBOOK2MAN" != "no"],
                            [DB2MAN="$DB2X_DOCBOOK2MAN"],
-                           [AC_MSG_WARN([docbookx2-man/db2x_docbook2man not found, no manpages will be built])]
+                           [AC_MSG_ERROR([docbookx2-man/db2x_docbook2man not found, required for building man pages])]
                     )]
             )]
        )