diff --git a/CHANGES.md b/CHANGES.md
index 0ea31e1..4430c5d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -8,6 +8,7 @@ Changes in Mini-XML 4.0.4
 - Fixed an issue when reporting errors with a `NULL` options pointer
   (Issue #329)
 - Fixed some compiler warnings (Issue #333)
+- Dropped unused `long long` config tests (Issue #335)
 
 
 Changes in Mini-XML 4.0.3
diff --git a/config.h.in b/config.h.in
index 1f638a7..9b79111 100644
--- a/config.h.in
+++ b/config.h.in
@@ -32,13 +32,6 @@
 #  define inline
 
 
-//
-// Long long support
-//
-
-#  undef HAVE_LONG_LONG_INT
-
-
 //
 // Have <pthread.h>?
 //
diff --git a/configure b/configure
index ceedcb9..2ac9290 100755
--- a/configure
+++ b/configure
@@ -1522,6 +1522,39 @@ fi
 
 } # ac_fn_c_try_compile
 
+# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists and can be compiled using the include files in
+# INCLUDES, setting the cache variable VAR accordingly.
+ac_fn_c_check_header_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+printf %s "checking for $2... " >&6; }
+if eval test \${$3+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  eval "$3=yes"
+else $as_nop
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_header_compile
+
 # ac_fn_c_try_link LINENO
 # -----------------------
 # Try to link conftest.$ac_ext, and return whether this succeeded.
@@ -1568,82 +1601,6 @@ fi
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_link
-
-# ac_fn_c_try_run LINENO
-# ----------------------
-# Try to run conftest.$ac_ext, and return whether this succeeded. Assumes that
-# executables *can* be run.
-ac_fn_c_try_run ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  if { { ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-printf "%s\n" "$ac_try_echo"; } >&5
-  (eval "$ac_link") 2>&5
-  ac_status=$?
-  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; } && { ac_try='./conftest$ac_exeext'
-  { { case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-printf "%s\n" "$ac_try_echo"; } >&5
-  (eval "$ac_try") 2>&5
-  ac_status=$?
-  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; }
-then :
-  ac_retval=0
-else $as_nop
-  printf "%s\n" "$as_me: program exited with status $ac_status" >&5
-       printf "%s\n" "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-       ac_retval=$ac_status
-fi
-  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
-  as_fn_set_status $ac_retval
-
-} # ac_fn_c_try_run
-
-# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
-# -------------------------------------------------------
-# Tests whether HEADER exists and can be compiled using the include files in
-# INCLUDES, setting the cache variable VAR accordingly.
-ac_fn_c_check_header_compile ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
-printf %s "checking for $2... " >&6; }
-if eval test \${$3+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-$4
-#include <$2>
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"
-then :
-  eval "$3=yes"
-else $as_nop
-  eval "$3=no"
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-eval ac_res=\$$3
-	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-printf "%s\n" "$ac_res" >&6; }
-  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
-
-} # ac_fn_c_check_header_compile
 ac_configure_args_raw=
 for ac_arg
 do
@@ -4057,134 +4014,6 @@ esac
 
 
 
-
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for unsigned long long int" >&5
-printf %s "checking for unsigned long long int... " >&6; }
-if test ${ac_cv_type_unsigned_long_long_int+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  ac_cv_type_unsigned_long_long_int=yes
-     case $ac_prog_cc_stdc in
-       no | c89) ;;
-       *)
-	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-  /* For now, do not test the preprocessor; as of 2007 there are too many
-	 implementations with broken preprocessors.  Perhaps this can
-	 be revisited in 2012.  In the meantime, code should not expect
-	 #if to work with literals wider than 32 bits.  */
-      /* Test literals.  */
-      long long int ll = 9223372036854775807ll;
-      long long int nll = -9223372036854775807LL;
-      unsigned long long int ull = 18446744073709551615ULL;
-      /* Test constant expressions.   */
-      typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
-		     ? 1 : -1)];
-      typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
-		     ? 1 : -1)];
-      int i = 63;
-int
-main (void)
-{
-/* Test availability of runtime routines for shift and division.  */
-      long long int llmax = 9223372036854775807ll;
-      unsigned long long int ullmax = 18446744073709551615ull;
-      return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
-	      | (llmax / ll) | (llmax % ll)
-	      | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
-	      | (ullmax / ull) | (ullmax % ull));
-  ;
-  return 0;
-}
-
-_ACEOF
-if ac_fn_c_try_link "$LINENO"
-then :
-
-else $as_nop
-  ac_cv_type_unsigned_long_long_int=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam \
-    conftest$ac_exeext conftest.$ac_ext;;
-     esac
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_unsigned_long_long_int" >&5
-printf "%s\n" "$ac_cv_type_unsigned_long_long_int" >&6; }
-  if test $ac_cv_type_unsigned_long_long_int = yes; then
-
-printf "%s\n" "#define HAVE_UNSIGNED_LONG_LONG_INT 1" >>confdefs.h
-
-  fi
-
-
-
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for long long int" >&5
-printf %s "checking for long long int... " >&6; }
-if test ${ac_cv_type_long_long_int+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  ac_cv_type_long_long_int=yes
-      case $ac_prog_cc_stdc in
-	no | c89) ;;
-	*)
-	  ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
-	  if test $ac_cv_type_long_long_int = yes; then
-	    	    	    	    if test "$cross_compiling" = yes
-then :
-  :
-else $as_nop
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <limits.h>
-		   #ifndef LLONG_MAX
-		   # define HALF \
-			    (1LL << (sizeof (long long int) * CHAR_BIT - 2))
-		   # define LLONG_MAX (HALF - 1 + HALF)
-		   #endif
-int
-main (void)
-{
-long long int n = 1;
-		   int i;
-		   for (i = 0; ; i++)
-		     {
-		       long long int m = n << i;
-		       if (m >> i != n)
-			 return 1;
-		       if (LLONG_MAX / 2 < m)
-			 break;
-		     }
-		   return 0;
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"
-then :
-
-else $as_nop
-  ac_cv_type_long_long_int=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
-	  fi;;
-      esac
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_long_long_int" >&5
-printf "%s\n" "$ac_cv_type_long_long_int" >&6; }
-  if test $ac_cv_type_long_long_int = yes; then
-
-printf "%s\n" "#define HAVE_LONG_LONG_INT 1" >>confdefs.h
-
-  fi
-
-
-
 # Check whether --enable-threads was given.
 if test ${enable_threads+y}
 then :
diff --git a/configure.ac b/configure.ac
index bc371f4..d862a5b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -104,10 +104,6 @@ dnl Inline functions...
 AC_C_INLINE
 
 
-dnl Check for "long long" support...
-AC_TYPE_LONG_LONG_INT
-
-
 dnl Threading support
 AC_ARG_ENABLE([threads], AS_HELP_STRING([--disable-threads], [disable multi-threading support, default=no]))
 
diff --git a/vcnet/config.h b/vcnet/config.h
index 992d7e4..1b47239 100644
--- a/vcnet/config.h
+++ b/vcnet/config.h
@@ -67,13 +67,6 @@
 #  define inline _inline
 
 
-//
-// Long long support
-//
-
-#  define HAVE_LONG_LONG_INT 1
-
-
 //
 // Have <pthread.h>?
 //
diff --git a/xcode/config.h b/xcode/config.h
index 71cde81..cdf10f3 100644
--- a/xcode/config.h
+++ b/xcode/config.h
@@ -32,13 +32,6 @@
 #  define inline
 
 
-//
-// Long long support
-//
-
-#  define HAVE_LONG_LONG_INT 1
-
-
 //
 // Have <pthread.h>?
 //