diff --git a/configure.ac b/configure.ac
index 84b5ec2..a43ba8c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -226,10 +226,9 @@ AC_ARG_ENABLE(glib,
 
 if test "$enable_glib" = "yes"; then
     GLIB_PACKAGE=glib-2.0
-    PKG_CHECK_MODULES([GLIB], [$GLIB_PACKAGE], HAVE_GLIB=true, HAVE_GLIB=false)
+    PKG_CHECK_MODULES([GLIB], [$GLIB_PACKAGE >= 2.68], HAVE_GLIB=true, HAVE_GLIB=false)
     if test "x$HAVE_GLIB" = "xtrue"; then
         GLIB_CFLAGS="$GLIB_CFLAGS -DHAVE_GLIB=1"
-        AC_CHECK_LIB($GLIB_PACKAGE, g_memdup2, [GLIB_CFLAGS="$GLIB_CFLAGS -DHAVE_G_MEMDUP2=1"])
         AC_SUBST(GLIB_PACKAGE)
     else
         enable_glib=no
diff --git a/include/mdbprivate.h b/include/mdbprivate.h
index 9d3e9a7..b793e9a 100644
--- a/include/mdbprivate.h
+++ b/include/mdbprivate.h
@@ -26,10 +26,6 @@
  * used within mdbtools so they won't be exported to calling programs.
  */
 
-#ifndef HAVE_G_MEMDUP2
-#define g_memdup2 g_memdup
-#endif
-
 #ifdef __cplusplus
   extern "C" {
 #endif