+dnl ** Obtain the value of a C constant.
+dnl The value will be `0' if the constant is undefined.
+dnl
+dnl This is set up so that the argument can be a shell variable.
+dnl
+AC_DEFUN(FPTOOLS_CHECK_CCONST,
+[
+eval "def_name=CCONST_$1"
+eval "cv_name=ac_cv_cconst_$1"
+AC_MSG_CHECKING(value of $1)
+AC_CACHE_VAL($cv_name,
+[AC_TRY_RUN([#include <stdio.h>
+#include <errno.h>
+main()
+{
+ FILE *f=fopen("conftestval", "w");
+ if (!f) exit(1);
+ fprintf(f, "%d\n", $1);
+ exit(0);
+}],
+eval "$cv_name=`cat conftestval`",
+eval "$cv_name=0",
+ifelse([$2], , , eval "$cv_name=$2"))])dnl
+eval "fptools_check_cconst_result=`echo '$'{$cv_name}`"
+AC_MSG_RESULT($fptools_check_cconst_result)
+AC_DEFINE_UNQUOTED($def_name, $fptools_check_cconst_result)
+unset fptools_check_cconst_result
+])
+
+dnl ** Invoke AC_CHECK_CCONST on each argument (which have to separate with
+dnl spaces)
+dnl
+AC_DEFUN(FPTOOLS_CHECK_CCONSTS,
+[for ac_const_name in $1
+do
+FPTOOLS_CHECK_CCONST($ac_const_name)dnl
+done
+])
+
+