Makefile questions

[Dan Nicolaescu]

Does anyone know why some variables in our Makefiles use $() and some ${} ?

For example in in src/Makefile.in there's a mixture of both:

LIBES = $(LIBS) $(LIBX_BASE) $(LIBX_OTHER) $(LIBSOUND) \
   $(RSVG_LIBS) ${IMAGEMAGICK_LIBS} $(DBUS_LIBS) \
   ${LIBXML2_LIBS} $(LIBGPM) $(LIBRESOLV) $(LIBS_SYSTEM) \
   $(LIBS_TERMCAP) $(GETLOADAVG_LIBS) ${GCONF_LIBS} ${LIBSELINUX_LIBS} \
   $(FREETYPE_LIBS) $(FONTCONFIG_LIBS) $(LIBOTF_LIBS) $(M17N_FLT_LIBS) \
   $(LIBGNUTLS_LIBS) \
   $(LIB_GCC) $(LIB_MATH) $(LIB_STANDARD) $(LIB_GCC)


Also why the ugly ${lispsource}loaddefs.el instead of ${lispsource}/loaddefs.el 
?