[igraph] installation error with igraph-0.5.3 on ubuntu 10.04 LTS

[Yi Cao]

Hello developers,

   I was trying to install the igraph 0.5.3 into my ubuntu 10.04 LTS but failed.

   1. the ./configure process was successful.
   2. when I tried to make,the content displayed was as follows:

          (.......)
        libtool: link: ranlib .libs/libigraph.a
        libtool: link: rm -fr.libs/libigraph.lax
        libtool: link (cd ".libs" &&rm -f "libigraph.la" && ln -s "../libigraph.la" ")

      make[3]:Leaving directory '/home/caoyi/Downloads/igraph-

0.5.3/src'
      make[2]:Leaving directory '/home/caoyi/Downloads/igraph-0.5.3/src'
      Making all in tests
      make[2]: Entering directory'/home/caoyi/Downloads/igraph-0.5.3/tests'
      make[2]: Nothing to be done for 'all'
      make[2]:Leaving directory'/home/caoyi/Downloads/igraph-0.5.3/tests'
      Making all in interfaces
      make[2]: entering directory'/home/caoyi .......'
      make[3]: entering directory'/home/caoyi......
      make[3]: Nothing to be done for 'all-am'
      make[3]: Leaving directory'/home/caoyi .......'
      make[2]: Leaving directory '/home/caoyi......'
      make[2]: Entering directory '/home/caoyi.......'
      make[2]: leaving directory  '/home/caoyi.......'
      make[1]: leaving directory '/home/caoyi........'

3. I ignored the content above and continued to "make install", then the errors occurred, and displayed as follows:
             making install in src
             make[1]: Entering directory'/home/caoyi/Downloads/igraph-0.5.3/src'
             make   install-am
             make[2]: Entering directory '/home/caoyi/Downloads/igraph-0.5.3/src'
             make[3]:Entering directory '/home/caoyi/Downloads/igraph-0.5.3/src'
test -z"usr/local/lib" || /bin/mkdir -p "/usr/local/lib"
    /bin/bash../libtool    --mode=install /usr/bin/install -c libigraph.la '/usr/local/lib'
libtool:install: /usr/bin/install  -c .libs/libigraph.so.0.0.0 /usr/local/lib/libigraph.so.0.0.0
/usr/bin/install:cannot creat regular file '/usr/local/lib/libigraph.so.0.0.0': Permission denied
make[3]:***[install-libLTLIBRARIES] Error 1

anyone got any idea how this could happen?  your kindness will be appreciated.  Thank you.