libtool error: AGE '2' is greater than the current interface '0'

while compiling xdmcp i get:

libtool: link: AGE `2' is greater than the current interface number `0'
libtool: link: `0:1:2' is not valid version information
make[1]: *** [libXdmcp.la] Error 1
make[1]: Leaving directory `/2/freed/Xdmcp'
make: *** [all] Error 2

what is this error?

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