---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 3c5ba4d..5705702 100644
--- 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])
-- 
2.18.0.rc2

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