I used a lot of advice from 
1. http://www-hiraki.is.s.u-tokyo.ac.jp/members/tomari/runspec.html
2. http://ardorem.blogspot.com/2015/04/spec-2000-build-error.html
3. http://pages.cs.wisc.edu/~lena/spec.php
4. https://markgottscho.wordpress.com/2013/10/31/cross-compiling-spec2006-benchmarks-for-alpha-isa-on-ubuntu-12-04-x86-64/

Please check the above websites if you need more help.
1. Latest gcc uses aggressive optimiztions to cause segmentation faults in some benchmarks. Use-fno-aggressive-loop-optimizations to COPTIMIZE, CXXOPTIMIZE and FOPTIMIZE

2. Missing libraries for some benchmarks:
	i) -include cstdlib -include cstring for xalancbmk CXXPORTABILITY
	ii) -include cstdlib -include cstring -include cstddef for dealII for CXXPORTABILITY

3. runtime failure for wrf
	-fno-second-underscore for wrf FPORTABILITY