libyaml / configure.ac

Diff from to

configure.ac

 AC_PROG_MAKE_SET
 AC_PROG_LIBTOOL
 
+AC_CHECK_PROG(DOXYGEN, [doxygen], [true], [false])
+AM_CONDITIONAL(DOXYGEN, [test "$DOXYGEN" = true])
+
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([stdlib.h])
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