ax_with_prog

Locates an installed program binary, placing the result in the precious variable VARIABLE. Accepts a present VARIABLE, then --with-program, and failing that searches for program in the given path (which defaults to the system path). If program is found, VARIABLE is set to the full path of the binary; if it is not found VARIABLE is set to VALUE-IF-NOT-FOUND if provided, unchanged otherwise.

A typical example could be the following one:

      AX_WITH_PROG(PERL,perl)

NOTE: This macro is based upon the original AX_WITH_PYTHON macro from Dustin J. Mitchell <dustin@cs.uchicago.edu>.

AC_DEFUN([AX_WITH_PROG],[
    AC_PREREQ([2.61])

    pushdef([VARIABLE],$1)
    pushdef([EXECUTABLE],$2)
    pushdef([VALUE_IF_NOT_FOUND],$3)
    pushdef([PATH_PROG],$4)

    AC_ARG_VAR(VARIABLE,Absolute path to EXECUTABLE executable)

    AS_IF(test -z "$VARIABLE",[
        AC_MSG_CHECKING(whether EXECUTABLE executable path has been provided)
        AC_ARG_WITH(EXECUTABLE,AS_HELP_STRING([--with-EXECUTABLE=[[[[PATH]]]]],absolute path to EXECUTABLE executable), [
            AS_IF([test "$withval" != "yes"],[
                VARIABLE="$withval"
                AC_MSG_RESULT($VARIABLE)
            ],[
                VARIABLE=""
                AC_MSG_RESULT([no])
            ])
        ],[
            AC_MSG_RESULT([no])
        ])

        AS_IF(test -z "$VARIABLE",[
            AC_PATH_PROG([]VARIABLE[],[]EXECUTABLE[],[]VALUE_IF_NOT_FOUND[],[]PATH_PROG[])
        ])
    ])

    popdef([PATH_PROG])
    popdef([VALUE_IF_NOT_FOUND])
    popdef([EXECUTABLE])
    popdef([VARIABLE])
])

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