Hi,

shouldn't the use of RPATH_FLAG be protected by a test for _USE_RPATH?
mk/buildlink?/bsd.buildlink?.mk does this, although through a comparison
against "yes" instead of !empty(_USE_RPATH:M[yY][eE][sS]).

bsd.pkg.mk uses RPATH_FLAG without this protection:

  .if defined(USE_X11)
  X11_LDFLAGS+=           -Wl,${RPATH_FLAG}${X11BASE}/lib
  ...
  .if !empty(USE_BUILDLINK2:M[nN][oO]) && !empty(USE_BUILDLINK3:M[nN][oO])
  LDFLAGS+=               -Wl,${RPATH_FLAG}${LOCALBASE}/lib 
  ...
  PKGCONFIG_OVERRIDE_SED= \
        -e 's|^\(Libs:.*[       ]\)-L\([        ]*[^ ]*\)\(.*\)$$|\1${_COMPILER_LD_FLAG}${RPATH_FLAG}\2 -L\2\3|'
  ...

xaw.buildlink2.mk does the same:

  LIBXAW?=                -L${X11BASE}/lib${ABI} -Wl,${RPATH_FLAG}${X11BASE}/lib${ABI} -lXaw

The stumbled over this while trying to use pkgsrc on a platform where
_USE_RPATH=no and _OPSYS_RPATH_NAME/RPATH_FLAG is empty.

ciao
     Klaus