diff --git a/tools/compat/nl_types.h b/tools/compat/nl_types.h
index 1c114eb8a..9bb482da4 100644
--- a/tools/compat/nl_types.h
+++ b/tools/compat/nl_types.h
@@ -1,5 +1,15 @@
 /*	$NetBSD: nl_types.h,v 1.1 2002/01/29 10:20:32 tv Exp $	*/
 
 #ifdef _NLS_PRIVATE
+
+/* #if defined(__minix) */
+/* <sys/cdefs> defines __format_arg, but on some other platforms it doesn't.
+ * <nl_types.h> includes <sys/cdefs> because it needs __format_arg. As it might
+ * not be defined, we do it here as a work around. */
+#ifndef __format_arg
+#define __format_arg(fmtarg)	__attribute__((__format_arg__ (fmtarg)))
+#endif
+/* #endif defined(__minix) */
+
 #include "../../include/nl_types.h"
 #endif
diff --git a/tools/llvm-tblgen/Makefile b/tools/llvm-tblgen/Makefile
index 7690b24d0..b5f846819 100644
--- a/tools/llvm-tblgen/Makefile
+++ b/tools/llvm-tblgen/Makefile
@@ -3,5 +3,7 @@
 HOSTPROGNAME=	${_TOOL_PREFIX}llvm-tblgen
 HOSTPROG_CXX=	${_TOOL_PREFIX}llvm-tblgen
 HOST_SRCDIR=	external/bsd/llvm/bin/tblgen
+# MINIX, for OSX Crosscompilation support
+CPPFLAGS+=	-D_NLS_PRIVATE=1
 
 .include "${.CURDIR}/../Makefile.host"