diff -Nur u-boot-2012.04.01.orig/tools/mkimage.c u-boot-2012.04.01/tools/mkimage.c
--- u-boot-2012.04.01.orig/tools/mkimage.c	Wed Apr 25 15:22:50 2012
+++ u-boot-2012.04.01/tools/mkimage.c	Wed Mar  6 17:09:29 2013
@@ -449,6 +449,7 @@
 #if defined(_POSIX_SYNCHRONIZED_IO) && \
    !defined(__sun__) && \
    !defined(__FreeBSD__) && \
+   !defined(__OpenBSD__) && \
    !defined(__APPLE__)
 	(void) fdatasync (ifd);
 #else
@@ -492,6 +493,7 @@
 #if defined(_POSIX_SYNCHRONIZED_IO) && \
    !defined(__sun__) && \
    !defined(__FreeBSD__) && \
+   !defined(__OpenBSD__) && \
    !defined(__APPLE__)
 	(void) fdatasync (ifd);
 #else