libpcap requires Flex 2.5.31 issue

[Joseph Freemaker <joseph_freemaker () yahoo com>]

When compiling libpcap on AIX 6.1 receive the error:

configure: error: flex is insufficient to compile libpcap. libpcap requires Flex 2.5.31 or later, or a compatible 
version of lex.

However flex 2.5.4 is installed per the below:
$ flex --versionflex version 2.5.4

Is there a workaround for this issue?
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