[PATCH] renameat2: fix compilation on alpine linux

[Pádraig Brady]

* m4/renameat.m4: Check for <linux/fs.h> presence.
* lib/renameat2.h: Only include <linux/fs.h> if present.
Reported by Assaf Gordon on Alpine Linux.
---
 ChangeLog       | 7 +++++++
 lib/renameat2.h | 2 +-
 m4/renameat.m4  | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 994123a..0b3c06a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2017-08-30  Pádraig Brady  <address@hidden>
+
+       renameat2: fix compilation on alpine linux
+       * m4/renameat.m4: Check for <linux/fs.h> presence.
+       * lib/renameat2.h: Only include <linux/fs.h> if present.
+       Reported by Assaf Gordon on Alpine Linux.
+
 2017-08-24  Paul Eggert  <address@hidden>
 
        glob: try to port recent changes to MS-Windows
diff --git a/lib/renameat2.h b/lib/renameat2.h
index da3d78c..f69929b 100644
--- a/lib/renameat2.h
+++ b/lib/renameat2.h
@@ -18,7 +18,7 @@
 
 /* Get RENAME_* macros from linux/fs.h if present, otherwise supply
    the traditional Linux values.  */
-#ifdef __linux__
+#if HAVE_LINUX_FS_H
 # include <linux/fs.h>
 #endif
 #ifndef RENAME_NOREPLACE
diff --git a/m4/renameat.m4 b/m4/renameat.m4
index cfbfe15..1b97774 100644
--- a/m4/renameat.m4
+++ b/m4/renameat.m4
@@ -14,6 +14,7 @@ AC_DEFUN([gl_FUNC_RENAMEAT],
   AC_REQUIRE([gl_FUNC_RENAME])
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_CHECK_HEADERS([linux/fs.h])
   AC_CHECK_FUNCS_ONCE([renameat])
   if test $ac_cv_func_renameat = no; then
     HAVE_RENAMEAT=0
-- 
2.9.3