Added documentation generation to build process

git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@525 96b47cad-a561-4643-ad3b-153ac7d7599c

virtualsmartcard/configure.ac

@@ -53,6 +53,17 @@ if test "${serialdropdir}" = false ; then
 	fi
 fi
 
+# Documentation (default: no)
+AC_ARG_ENABLE([doc],AS_HELP_STRING([--enable-doc],[Enable documentation generation.]),[enable_doc=$enableval],[enable_doc="no"])
+if test x"$enable_doc" = "xyes"
+then
+    AC_PATH_PROG([DOXYGEN], [doxygen])
+    if test x$DOXYGEN = x
+    then
+        AC_MSG_ERROR([doxygen is mandatory.])
+    fi
+fi
+AM_CONDITIONAL(DOC_ENABLED, [test x"$enable_doc" = xyes])
 
 # Checks for header files.
 AC_CHECK_HEADERS([arpa/inet.h stdint.h stdlib.h string.h sys/socket.h sys/time.h unistd.h])