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Don't build the API docs if doxygen isn't available.

Updates the configure check to match the one in the Opus
repository.

--- a/configure.ac

+++ b/configure.ac

@@ -84,16 +84,12 @@

   AS_HELP_STRING([--disable-doc], [Do not build API documentation]),,

   [enable_doc=yes]

 )

-

-if test "x$enable_doc" != "xno"; then

-  AC_CHECK_PROG(HAVE_DOXYGEN, doxygen, true, false)

-  if test "x$HAVE_DOXYGEN" = "xfalse" -a "x$enable_doc" = "xyes" ; then

-    AC_MSG_ERROR([*** Doxygen not found. Cannot build API documentation. ***])

-  fi

-else

-  HAVE_DOXYGEN=false

+AC_CHECK_PROG(HAVE_DOXYGEN, doxygen, yes, no)

+if test "$HAVE_DOXYGEN" != "yes" -o "$enable_doc" != "yes" ; then

+  HAVE_DOXYGEN="no"

+  enable_doc="no"

 fi

-AM_CONDITIONAL(HAVE_DOXYGEN,$HAVE_DOXYGEN)

+AM_CONDITIONAL(HAVE_DOXYGEN, [test $HAVE_DOXYGEN = yes])

 AC_OUTPUT([

   Makefile