configure.ac: better message when a2x is missing

Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/configure.ac b/configure.ac
index 3c5ba4dbe1944d9179b4296b7e1704682af68ca7..570570263076bc970748edce714d88174598654c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -82,7 +82,7 @@ AM_COND_IF([BUILD_PDF], [
 AS_IF([test "$need_a2x" = "yes"], [
        AC_CHECK_PROG(A2X, [a2x], [found], [no])
        AS_IF([test "$A2X" != "found"],
-            [AC_MSG_ERROR([a2x not found])])
+            [AC_MSG_ERROR([a2x not found, please install asciidoc])])
 ])
 
 PKG_CHECK_MODULES([LIBMNL], [libmnl >= 1.0.3])