M configure.in → configure.in

@@ -26,6 +26,13 @@ 
 dnl Check for system header files
 AC_HEADER_STDC
 AC_CHECK_HEADERS(errno.h ctype.h dirent.h fcntl.h libgen.h locale.h nl_types.h process.h signal.h stdarg.h stdio.h time.h unistd.h sys/param.h sys/select.h sys/signal.h sys/stat.h sys/time.h sys/types.h sys/wait.h)
+
+AC_CHECK_HEADERS(sstream, ,
+        [ AC_CHECK_HEADERS(strstream,,
+            [AC_MSG_ERROR([Your libstdc++ doesn't have the sstream or strstream classes])]
+        )]
+)
+
 AC_HEADER_TIME
 
 dnl Check for existance of basename(), setlocale() and strftime()