From a4165c822baf74f5c1906593a984f996b11058d1 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Thu, 5 Oct 2017 11:15:24 +0100
Subject: [PATCH] =?utf8?q?lib:=20Allow=20compilation=20with=20Augeas=20<?=
 =?utf8?q?=201.8.0=20which=20lacked=20=E2=80=98aug=5Fsource=E2=80=99=20fun?=
 =?utf8?q?ction.?=
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Fixes commit 05f00ac539c2cd0cf5dcbf90d031023a7e973ae7.
---
 augeas-c.c   | 4 ++++
 configure.ac | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/augeas-c.c b/augeas-c.c
index da11acc..3c523ea 100644
--- a/augeas-c.c
+++ b/augeas-c.c
@@ -390,6 +390,7 @@ ocaml_augeas_transform (value tv, value lensv, value filev, value modev)
 CAMLprim value
 ocaml_augeas_source (value tv, value pathv)
 {
+#ifdef HAVE_AUG_SOURCE
   CAMLparam2 (tv, pathv);
   CAMLlocal2 (optv, v);
   augeas_t t = Augeas_t_val (tv);
@@ -411,4 +412,7 @@ ocaml_augeas_source (value tv, value pathv)
     raise_error (t, "Augeas.source");
 
   CAMLreturn (optv);
+#else
+  caml_failwith ("Augeas.source: function not implemented");
+#endif
 }
diff --git a/configure.ac b/configure.ac
index e0b0f7a..6b27aff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,12 @@ PKG_CHECK_MODULES([LIBXML2], [libxml-2.0])
 dnl Check for Augeas C library.
 PKG_CHECK_MODULES([AUGEAS], [augeas])
 
+dnl Check for aug_source function, added in Augeas 1.8.0.
+old_LIBS="$LIBS"
+LIBS="$AUGEAS_LIBS"
+AC_CHECK_FUNCS([aug_source])
+LIBS="$old_LIBS"
+
 dnl Produce output files.
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_FILES([Makefile META])
-- 
1.8.3.1