bash - awk giving different behavior on different systems -

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i using awk grep paragraph containing specific keyword until record seperator in case space.

awk -vrs= /\<keyword2\>/ file.txt

and file.txt contains this

this first keyword1 occurance , line in first paragraph  second keyword2 occurance , line in second paragraph

now output of awk command should 

this second keyword2 occurance , line in second paragraph

but works on 1 of system. doesn't work on others. please help

error found
installed nawk on ubuntu 14.04 , not work.
works fine gawk

you can try sed:

sed -n '/\<keyword2\>/,/^$/p' file.txt

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