-: ${suffix=@PROG_EXT@}
-: ${DESTDIR=@DESTDIR@}
-: ${prefix=@prefix@}
-: ${exec_prefix=@exec_prefix@}
-: ${bindir=@bindir@}
-: ${top_srcdir=@top_srcdir@}
-: ${srcdir=@srcdir@}
-: ${datadir=@datadir@}
-: ${ticdir=@TERMINFO@}
-: ${source=@TERMINFO_SRC@}
-: ${LN_S="@LN_S@"}
-: ${THAT_CC=cc}
-: ${THIS_CC=cc}
-: ${ext_funcs=@NCURSES_EXT_FUNCS@}
+: "${suffix:=@EXEEXT@}"
+: "${DESTDIR:=@DESTDIR@}"
+: "${prefix:=@prefix@}"
+: "${exec_prefix:=@exec_prefix@}"
+: "${bindir:=@bindir@}"
+: "${top_srcdir:=@top_srcdir@}"
+: "${srcdir:=@srcdir@}"
+: "${datarootdir:=@datarootdir@}"
+: "${datadir:=@datadir@}"
+: "${TIC_PATH:=@TIC@}"
+: "${ticdir:=@TERMINFO@}"
+: "${source:=@TERMINFO_SRC@}"
+: "${cross_compiling:=no}"
+: "${ext_funcs:=@NCURSES_EXT_FUNCS@}"