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# Try to locate best version of auto*
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# By Michael Pyne <michael.pyne@kdemail.net>
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# This code is public domain. You may use it however you like (including
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# Emulate the 'which' program.
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my @paths = split(/:/, $ENV{'PATH'});
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return "$path/$prog" if -x "$path/$prog";
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# Subroutine to determine the highest installed version of the given program,
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# searching from the given paths.
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my ($program, @paths) = @_;
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my $best_version_found = '0'; # Deliberately a string.
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my %minimumVersions = (
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# Allow user to use environment variable to override search.
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return $ENV{uc $program} if $ENV{uc $program};
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@files = glob "$prefix/$program*";
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# Don't check non-executable scripts.
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($version) = $file =~ /$prefix\/$program-?(.*)$/;
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$version =~ s/-|\.//g;
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# Special case some programs to make sure it has a minimum version.
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if (not $version and exists $minimumVersions{$program})
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my $min_version = $minimumVersions{$program};
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my $versionOutput = `$program --version 2>/dev/null | head -n 1`;
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# If we can't run the script to get the version it likely won't work later.
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next unless $versionOutput;
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# Use number.number for version (we don't need the excess in general).
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($versionOutput) = ($versionOutput =~ /(\d\.\d)/);
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# Use lt to do lexicographical comparison of strings (which should be
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# equivalent and doesn't involve issues with floating point conversions).
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if (not $versionOutput or $versionOutput lt $min_version)
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# If no version suffix then use it in favor of a versioned autotool
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# since the ever-popular WANT_AUTOFOO should then work (in theory).
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return $file unless $version;
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# Emulate 'which', and abort if we've already seen this version.
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next if exists $versions{$version};
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# Save filename of program.
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$versions{$version} = $file;
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# Use string comparison so that e.g. 253a will be > 253 but < 254.
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if ($version gt $best_version_found)
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$best_version_found = $version;
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return $versions{$best_version_found};
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# Find an appropriate "which" program for later use by the shell script calling
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for $candidate ('type -p', 'which', 'type')
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$test = `$candidate sh 2>/dev/null`;
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return $candidate if -x $test;
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# Uses which() to find a program unless the user provided its path in the
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# environment (the upper case program name is searched).
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$suffix = ""; # For use if @_ has only one param.
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my ($program, $suffix) = @_;
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return $ENV{uc $program} if $ENV{uc $program};
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return which("$program$suffix");
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@paths = split(/:/, $ENV{'PATH'});
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# Make sure at least /usr/bin and /usr/local/bin are in this search.
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unshift @paths, '/usr/local/bin' unless grep $_ eq '/usr/local/bin', @paths;
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unshift @paths, '/usr/bin' unless grep $_ eq '/usr/bin', @paths;
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$autoconf = findBest('autoconf', @paths);
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($autoconf_suffix) = $autoconf =~ /.*autoconf(.*)$/;
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# Find matching autoconf companions.
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$autoheader = findProgram('autoheader', $autoconf_suffix);
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$autom4te = findProgram('autom4te', $autoconf_suffix);
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# Get best automake, and look for unsermake to possibly override it.
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$automake = findBest('automake', @paths);
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# backward compatible: if $UNSERMAKE points to a path, use it
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$unsermake = findProgram('unsermake') if (defined($ENV{'UNSERMAKE'}) and $ENV{'UNSERMAKE'} =~ /\//);
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# new compatible: if it says 'yes', use the one from path
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$unsermake = which('unsermake') if ($ENV{'UNSERMAKE'} ne 'no');
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($automake_suffix) = $automake =~ /.*automake(.*)$/;
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# Use unsermake if we found it.
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$automake = "$unsermake -c" if $unsermake;
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# Find matching automake companions.
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$aclocal = findProgram('aclocal', $automake_suffix);
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$which = findWhich();
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# Make sure we have all of the needed programs.
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for $i (qw'autoconf autoheader autom4te automake aclocal')
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print "# Unable to find $i!!\n";
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# Print results in eval-able form.
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AUTOHEADER="$autoheader"
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export AUTOCONF AUTOHEADER AUTOM4TE AUTOMAKE ACLOCAL WHICH
added
removed
admin/detect-autoconf.pl
