# Several convenience wrappers for checking the programs

# Check for required tool
AC_DEFUN([CTNG_CHECK_TOOL_REQ],
    [AC_CHECK_TOOLS([$1], [$2])
     AS_IF(
        [test -z "$$1"],
        [AC_MSG_ERROR([missing required tool: $2])])
    ])

# Check for required tool, set variable to full pathname
AC_DEFUN([CTNG_PATH_TOOL_REQ],
    [AC_ARG_VAR([$1], [Specify the full path to GNU $3])
     CTNG_CHECK_TOOL_REQ([$1], [$2])
     AS_CASE(
        [$$1],
        [/*],,
        [?*],[AC_MSG_CHECKING([for absolute path to $$1])
              $1=$(which $$1)
              AC_MSG_RESULT([$$1])])])

# Check for required program
AC_DEFUN([CTNG_CHECK_PROGS_REQ],
    [AC_CHECK_PROGS([$1], [$2])
     AS_IF(
        [test -z "$$1"],
        [AC_MSG_ERROR([missing required tool: $2])])
    ])

# Check for path to required program
AC_DEFUN([CTNG_PATH_PROGS_REQ],
    [AC_PATH_PROGS([$1], [$2])
     AS_IF(
        [test -z "$$1"],
        [AC_MSG_ERROR([missing required tool: $2])])
   ])