--- configure
+++ configure
@@ -10083,7 +10083,7 @@
    case $host_os in
      linux*|cygwin|mingw32*)
 	CPPFLAGS="$CPPFLAGS -Werror";
-	CXXFLAGS="$CXXFLAGS -Wno-deprecated -fsigned-char";
+	CXXFLAGS="$CXXFLAGS -Wno-deprecated";
 	if test x$enable_profiling = xyes; then
 	  CFLAGS="$CFLAGS -pg";
 	  CXXFLAGS="$CXXFLAGS -pg";
@@ -10104,7 +10104,7 @@
 else
     case $host_os in
 	 linux*|cygwin|mingw32*)
-		CXXFLAGS="$CXXFLAGS -ffast-math -fno-exceptions -fsigned-char";;
+		CXXFLAGS="$CXXFLAGS -ffast-math -fno-exceptions";;
 	 solaris*)
 		CFLAGS="$CFLAGS -O";
 		CXXFLAGS="$CXXFLAGS -O";;