--enable-debug now checks if gcc is used before it sets all those gcc-

specific options. This should make this option work on more platforms with
other compilers.

configure.in

@@ -743,7 +743,10 @@ AC_ARG_ENABLE(debug,
   *)   AC_MSG_RESULT(yes)
 
     CPPFLAGS="$CPPFLAGS -DMALLOCDEBUG"
-    CFLAGS="-W -Wall -Wwrite-strings -pedantic -Wundef -Wpointer-arith -Wcast-align -Wnested-externs -g" 
+    CFLAGS="$CFLAGS -g" 
+    if test "$GCC" = "yes"; then
+       CFLAGS="$CFLAGS -W -Wall -Wwrite-strings -pedantic -Wundef -Wpointer-arith -Wcast-align -Wnested-externs"
+    fi
        ;;
   esac ],
        AC_MSG_RESULT(no)