no need in by(common), it is a personal variant

[xorg/xkeyboard-config] / symbols / sun_vndr / Makefile.am

symbolsdir = $(xkb_base)/symbols/sun_vndr

dist_symbols_DATA = \
 cs cz de dk es \
 fi fr gb gr hu \
 it jp ko lt lv \
 nl no pl pt ru \
 se solaris sw tr tuv \
 tw us usb