Re: How to exit if program is not found

[Roger Pau Monné]

On Thu, Jun 14, 2012 at 5:01 PM, Timothy Madden <address@hidden> wrote:
> Hello
>
> I see in the info pages that autoconf macros check for various programs and
> set a variable if found, but how do I get the behaviour I see in most
> configure programs to exit with an error if a program is not found ?

I usually use the following macro:

AC_DEFUN([AX_PATH_PROG_OR_FAIL],
[AC_PATH_PROG([$1], [$2], [no])
if test x"${$1}" == x"no"
then
    AC_MSG_ERROR([Unable to find $2, please install $2])
fi])

So on my configure.ac I make the following calls:

AX_PATH_PROG_OR_FAIL([PERL], [perl])

Where "PERL" is the name of the variable where to store the path, and
"perl" is the name of the program to search for.

Hope this helps, Roger.