Use default system file if none found for uname

src/configure

@@ -1862,17 +1862,23 @@ ac_config_headers="$ac_config_headers common/autoconfig.h"
 
 
 
-sys=`uname`
-if test -f mk/$sys ; then
-    (cd mk; rm -f sysconf; ln -s $sys sysconf)
-else
-   cat <<EOF
-    No system configuration file found in mk/ for '$sys'. Maybe you
-    could try to write one, starting from one of the existing files, they
-    are really simple.
-EOF
-   exit 1
+sys=`uname | tr / _`
+
+if test ! -f mk/$sys ; then
+   { $as_echo "$as_me:$LINENO:
+    No system configuration file found in mk/ for uname = '$sys'.
+    Trying with Default file.
+    If the build fails, you'll need to write a configuration file, starting
+    from one of the existing ones." >&5
+$as_echo "$as_me:
+    No system configuration file found in mk/ for uname = '$sys'.
+    Trying with Default file.
+    If the build fails, you'll need to write a configuration file, starting
+    from one of the existing ones." >&6;}
+
+    sys=Default
 fi
+(cd mk; rm -f sysconf; ln -s $sys sysconf)
 
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'