rsyslog: O_WRONLY is defined in fcntl.h.

srcpkgs/rsyslog/patches/musl.patch

@@ -0,0 +1,10 @@
+--- tools/omfile.c.orig	2015-05-23 03:55:37.960658341 +0200
++++ tools/omfile.c	2015-05-23 03:55:53.471816125 +0200
+@@ -47,6 +47,7 @@
+ #include <ctype.h>
+ #include <libgen.h>
+ #include <unistd.h>
++#include <fcntl.h>
+ #include <sys/file.h>
+ #ifdef OS_SOLARIS
+ #	include <fcntl.h>

srcpkgs/rsyslog/template

@@ -1,7 +1,7 @@
 # Template file for 'rsyslog'
 pkgname=rsyslog
 version=8.10.0
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--enable-gnutls --enable-mysql --enable-pgsql
  --enable-imdiag --enable-imfile --enable-mail --enable-gssapi-krb5