#   compile  checkperms-1.11/checkperms.o

gcc -O2 -std=gnu99 -Wall -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wno-sign-compare
-Wno-traditional -Wa,--fatal-warnings -Wreturn-type -Wswitch
-Wshadow -Wcast-qual -Wwrite-strings -Wextra
-Wno-unused-parameter -Wno-sign-compare -Wsign-compare
-Wformat=2 -Wno-format-zero-length -Werror -c checkperms.c
--- .gdbinit ---
touch .gdbinit
--- checkperms.o ---
clang: error: unknown warning option '-Wno-traditional'
*** [checkperms.o] Error code 1

make: stopped in /WRKOBJDIR/sysutils/checkperms/work/checkperms-1.11
1 error

Strange, I did not get this error before: But anyway:

? mk/wrapper/transform-clang
Index: mk/wrapper/bsd.wrapper.mk
===================================================================
RCS file: /cvs/cvsroot/pkgsrc/mk/wrapper/bsd.wrapper.mk,v
retrieving revision 1.88
diff -u -r1.88 bsd.wrapper.mk
--- mk/wrapper/bsd.wrapper.mk	1 Mar 2013 13:27:38 -0000	1.88
+++ mk/wrapper/bsd.wrapper.mk	13 Oct 2013 06:10:08 -0000
@@ -318,6 +318,11 @@
 _WRAP_TRANSFORM.CXX=	${_WRAP_TRANSFORM.CC}
 .endif
 
+.if !empty(PKGSRC_COMPILER:Mclang)
+_WRAP_TRANSFORM.CC=	${WRAPPER_TMPDIR}/transform-clang
+_WRAP_TRANSFORM.CXX=	${_WRAP_TRANSFORM.CC}
+.endif
+
 _WRAP_CMD_SINK.LD=		${WRAPPER_TMPDIR}/cmd-sink-ld
 _WRAP_SKIP_TRANSFORM.IMAKE=	yes
 
@@ -528,6 +533,7 @@
 	cmd-sink-unixware-gcc \
 	transform-aix-cc \
 	transform-ccc-cc \
+	transform-clang \
 	transform-gcc \
 	transform-icc-cc \
 	transform-ido-cc \

New file transform-clang diff -u transform-{gcc,clang} will be

--- mk/wrapper/transform-gcc	2013-10-13 14:57:06.000000000 +0900
+++ mk/wrapper/transform-clang	2013-10-13 14:55:54.000000000 +0900
@@ -102,7 +102,6 @@ case $arg in
 -Wno-inline		|\
 -Wno-long-long		|\
 -Wno-sign-compare	|\
--Wno-traditional	|\
 -Wno-undef		|\
 -Wno-uninitialized	|\
 -Wno-unused		|\
@@ -120,7 +119,9 @@ case $arg in
 -Wundef			|\
 -Wwrite-strings		) transform_pass ;;
 
+
 # There are some packages suppressing all warnings. We don't want that.
+-Wno-traditional	|\
 -w			) transform_discard ;;
 
 # Options specific to g++.