If anyone has a spare minute, here's something that must be about as simple as 
they come to review. The additional code is all on one line.

http://trac.sagemath.org/sage_trac/ticket/7067

cddlib fails to build with the Sun compiler, complaining:

Undefined                       first referenced
  symbol                             in file
fabs                                ../lib-src/libcdd.a(cddio.o)


All it needed was this line in configure.in, to tell the configure script to 
look in the maths library for 'fabs'.

AC_CHECK_LIB(m, fabs)

After remaking the configure script, cddlib builds with the Sun compiler.

Dave

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