configure.ac:31: error: possibly undefined macro:AC_DEFINE

[zhaolucky]

Issue

When i run autogen.sh to build sigar at ** HP-UX 11.31**, i encounter this error:
configure.ac:31: error: possibly undefined macro:AC_DEFINE.

Info
The versions of related tools are as follows：
automake 1.14.1 autoconf 2.69 libtool 2.4.6 m4 1.4.18 pkg-config 0.28 perl v5.8.8