added -d option to util/install and also made the -m option optional. fixed compatibility issue on Solaris with lua-cjson: there is no isinf on Solaris 11.

util/configure

@@ -553,7 +553,7 @@ _EOC_
                 "LUA_LIB_DIR=$lualib_prefix";
 
             if ($on_solaris) {
-                $extra_opts .= " INSTALL=$root_dir/build/install";
+                $extra_opts .= " INSTALL=$root_dir/build/install CFLAGS=\"-g -O3 -Wall -pedantic -D'isinf(x)=0'\"";
             }
 
             if ($platform eq 'macosx') {

util/install

@@ -6,16 +6,15 @@ use warnings;
 use Getopt::Std qw(getopts);
 
 my %opts;
-getopts("m:", \%opts) or usage();
+getopts("dm:", \%opts) or usage();
 
 my $mode = $opts{m};
 
-if (!defined $mode) {
-    die "No -m option specified.\n";
+if ($opts{d}) {
+    shell("mkdir -p @ARGV");
+    exit;
 }
 
-my $mod = $opts{m};
-
 if (@ARGV < 2) {
     usage();
 }
@@ -46,8 +45,10 @@ if (!-d $target_dir) {
 shell("cp @src $dst");
 
 if (-f $dst) {
+    if (defined $mode) {
         chmod oct($mode), $dst or
             die "failed to change mode of $dst to $mode.\n";
+    }
 
     exit;
 }
@@ -62,13 +63,15 @@ for my $src (@src) {
         $name = $src;
     }
 
+    if (defined $mode) {
         my $target = "$target_dir/$name";
         chmod oct($mode), $target or
             die "failed to change mode of $target to $mode.\n";
+    }
 }
 
 sub usage {
-    die "Usage: install -m <attrs> <src>... <dst>\n";
+    die "Usage: install [-d] [-m <attrs>] <src>... <dst>\n";
 }
 
 sub shell {