ROSE Compiler Framework/Autotools

Utility Macros
http://www.gnu.org/software/autoconf-archive/ax_prog_doxygen.html
 * AX_PROG_DOXYGEN -- check for Doxygen


 * AX_WITH_PROG([VARIABLE],[program],[VALUE-IF-NOT-FOUND],[PATH])
 * check for a certain program in $PATH
 * http://www.gnu.org/software/autoconf-archive/ax_with_prog.html


 * AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
 * compare version number strings
 * http://www.gnu.org/software/autoconf-archive/ax_compare_version.html