From e9608cf2e589c019cd602cea6e9c9f201df36a71 Mon Sep 17 00:00:00 2001
From: Johannes Hofmann <Johannes.Hofmann@gmx.de>
Date: Tue, 7 Apr 2009 18:51:30 +0200
Subject: check for fsync() availability

---
 configure.ac          | 2 +-
 src/ImageMetaData.cxx | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f15cf0a..28acc01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -34,7 +34,7 @@ AC_FUNC_FORK
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
 AC_TYPE_SIGNAL
-AC_CHECK_FUNCS([strchr strdup strrchr strstr mkstemp])
+AC_CHECK_FUNCS([strchr strdup strrchr strstr mkstemp fsync])
 
 # Check for fltk
 AC_PATH_PROG(FLTKCONFIG,fltk-config)
diff --git a/src/ImageMetaData.cxx b/src/ImageMetaData.cxx
index a4e7174..7cedcf2 100644
--- a/src/ImageMetaData.cxx
+++ b/src/ImageMetaData.cxx
@@ -258,7 +258,10 @@ ImageMetaData::save_image_jpgcom(char *in_img, char *out_img) {
 		err++;
 	}
 
+#ifdef HAVE_FSYNC
 	fsync(tmp_fd); // make sure data is on disk before replacing orig file
+#endif
+
 	close(tmp_fd);
 
 	if (err == 0) { // only overwrite existing image if everything was ok
-- 
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