need help in makefile syntax??

[ms4800]

tmp = `echo $$MKCS_RISLABEL | awk -F"_" '{print $$2}'`

ifeq ($(tmp),FSPR6CGR)
bash_Version="bash-3.2"
else
bash_Version="bash-3.1"
endif


this is a piece of code i am using in makefile. The comparison is failing all the time. Any specific reason?
can the comparison syntax of bash be used there?

[kbw]

Is environment var MKCS_RISLABEL set? As a matter of curiosity, what's it's value?