avoid leading whitespace in libdirs variable

perl/perl.spec

@@ -32,7 +32,7 @@ Class:        CORE
 Group:        Perl
 License:      GPL/Artistic
 Version:      5.10.0
-Release:      20080413
+Release:      20080612
 
 #   list of sources
 Source0:      ftp://ftp.cpan.org/pub/CPAN/src/perl-%{version}.tar.gz
@@ -86,7 +86,13 @@ AutoReqProv:  no
     fi
     libdirs=""
     for dir in %{l_prefix}/lib /lib64 /usr/lib64 /lib /usr/lib /usr/ccs/lib; do
-        [ -d $dir ] && libdirs="$libdirs $dir"
+        if [ -d $dir ]; then
+            if [ ".$libdirs" = . ]; then
+                libdirs="$dir"
+            else
+                libdirs="$libdirs $dir"
+            fi
+        fi
     done
     ./Configure \
         -d -e -s \