trying to fix link pb on linux/win32

configure.in

@@ -549,7 +549,7 @@ if test "x$enable_contrib" != "xno"; then
     AC_CHECK_FILE(./contrib/DiscreteIntegration/Integration3D.cpp,DINTEGRATION="yes")
     if test "x${DINTEGRATION}" = "xyes"; then
       GMSH_DIRS="${GMSH_DIRS} contrib/DiscreteIntegration"
-      GMSH_LIBS="${GMSH_LIBS} -lGmshDIntegration"
+      GMSH_LIBS="${GMSH_LIBS} -lGmshDIntegration -lGmshNumeric"
       AC_DEFINE(HAVE_DINTEGRATION)
       BO="${BO} DIntegration"
     fi