diff --git a/m4/alugrid.m4 b/m4/alugrid.m4
index 1c82fad5015ab3e9a5bf1b094554b92249835731..3baeacef47d89a969b5ae1ffbeda94c3f418230e 100644
--- a/m4/alugrid.m4
+++ b/m4/alugrid.m4
@@ -16,7 +16,7 @@ ac_save_LIBS="$LIBS"
 ## do nothing if no --with-alugrid was supplied
 if test x$with_alugrid != x && test x$with_alugrid != xno ; then
 
-  if test x$with_alugrid == xyes ; then
+  if test x$with_alugrid = xyes ; then
     AC_MSG_ERROR([You have to provide a directory --with-alugrid=PATH])
   fi
 
@@ -32,12 +32,12 @@ if test x$with_alugrid != x && test x$with_alugrid != xno ; then
     ## check version number 
     NEEDEDALUGRID_VERSION=1.1
 
-    echo -n "checking ALUGrid version >= $NEEDEDALUGRID_VERSION... " 
+    AC_MSG_CHECKING([ALUGrid version >= $NEEDEDALUGRID_VERSION])
     if test -f $ALUGRID_VERSIONCHECK; then 
       ALUGRID_VERSION=`$ALUGRID_VERSIONCHECK -c $NEEDEDALUGRID_VERSION`
       if test "x$ALUGRID_VERSION" != "x-1"; then 
         ALUGRID_VERSIONNO=`$ALUGRID_VERSIONCHECK -v`
-        echo "yes (ALUGrid-$ALUGRID_VERSIONNO)"
+        AC_MSG_RESULT([yes (ALUGrid-$ALUGRID_VERSIONNO)])
       else 
         AC_MSG_ERROR([ALUGrid version is too old!])
       fi 
diff --git a/m4/grape.m4 b/m4/grape.m4
index 2c80881e5e16b4a13bb4f0c42f9e0e9e15933d22..b57e4dc7c6c40b274a2218c7a2687a77a3731354 100644
--- a/m4/grape.m4
+++ b/m4/grape.m4
@@ -7,7 +7,7 @@ AC_DEFUN([DUNE_PATH_GRAPE],[
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([AC_PATH_XTRA])
   AC_REQUIRE([DUNE_PATH_OPENGL])
-  AC_REQUIRE([AC_LIB_PROG_LD_GNU])
+  AC_REQUIRE([AC_PROG_LD_GNU])
 
   AC_ARG_WITH(grape,
     AC_HELP_STRING([--with-grape=PATH],[directory with Grape inside]))
@@ -56,7 +56,7 @@ if test "x$X_LIBS" != x && test x$with_grape != xno ; then
     LDFLAGS="$LDFLAGS $GL_LDFLAGS"
 
     # if we use the gnu linker add the grape path 
-    if test x$acl_cv_prog_gnu_ld = xyes ; then 
+    if test x$lt_cv_prog_gnu_ld = xyes ; then 
       GRAPE_LINKER_FLAGS="-Wl,--rpath -Wl,$GRAPEROOT"
     fi