Report errors when updating configuration files

autogen.sh

 #!/bin/sh
 
 if [ -x "`which autoreconf 2>/dev/null`" ] ; then
-  opt="-if"
+  opt="-i -f -W all,error"
 
   for i in $@; do
     case "$i" in
       -v)
-        opt=$opt"v"
+        opt="${opt} -v"
         ;;
     esac
   done

configure.ac

@@ -11,7 +11,7 @@ AC_CONFIG_MACRO_DIR([m4])
 # "foreign" means we don't follow GNU package layout standards
 # "1.11" means we require automake version 1.11 or newer
 # "subdir-objects" means put .o files in the same directory as the .c files
-AM_INIT_AUTOMAKE([foreign 1.11 subdir-objects])
+AM_INIT_AUTOMAKE([foreign 1.11 subdir-objects -Wall -Werror])
 
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 AC_CONFIG_HEADERS([orconfig.h])