How to install rpm file along with its all dependencies?

Use yum instead.

yum localinstall ...

For example:

yum localinstall http://pkgs.repoforge.org/subversion/subversion-devel-1.7.1-0.1.el6.rfx.i686.rpm

The example above will install the rpm and its dependencies automatically.

you may make local yum repository and then run command

yum install hpccsystems-platform_community-4.0.0-9.el6.x86_64.rpm

or find the online repository where this package is available and then put the url in baseurl in .repo file.

You can enable the EPEL Repository in RHEL - download the epel-release-6-8.noarch.rpm package using wget and then install it using rpm:

wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm rpm -ivh epel-release-6-8.noarch.rpm

Then, execute the following command:

yum install gcc-c++ gcc make bison flex binutils-devel openldap-devel libicu-devel libxslt-devel libarchive-devel boost-devel openssl-devel apr-devel apr-util-devel

Finally, install the hpccsystems-platform package:

rpm -Uvh hpccsystems-platform_community-4.0.0-9.el6.x86_64.rpm