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diff --git a/ucw/perl/UCW/Configure/C.pm b/ucw/perl/UCW/Configure/C.pm
index ec39630d..e3a7fdf8 100644
--- a/ucw/perl/UCW/Configure/C.pm
+++ b/ucw/perl/UCW/Configure/C.pm
@@ -46,15 +46,27 @@ $gccver >= 3000 or Fail "GCC older than 3.0 doesn't support C99 well enough.";
 ### CPU ###
 
 Test("ARCH", "Checking for machine architecture", sub {
-	my $mach = `uname -m`;
+	#
+	# We have to ask GCC for the target architecture, because it may
+	# differ from what uname tells us. This can happen even if we are
+	# not cross-compiling, for example on Linux with amd64 kernel, but
+	# i386 userspace.
+	#
+	my $gcc = Get("CC");
+	my $mach = `$gcc -dumpmachine 2>/dev/null`;
+	if (!$? && $mach ne "") {
+		$mach =~ s/-.*//;
+	} else {
+		$mach = `uname -m`;
+		Fail "Unable to determine machine type" if $? || $mach eq "";
+	}
 	chomp $mach;
-	Fail "Unable to determine machine type" if $? || $mach eq "";
 	if ($mach =~ /^i[0-9]86$/) {
 		return "i386";
 	} elsif ($mach =~ /^(x86[_-]|amd)64$/) {
 		return "amd64";
 	} else {
-		return "unknown";
+		return "unknown ($mach)";
 	}
 });
 
@@ -118,7 +130,8 @@ Test("CPU_ARCH", "Checking for CPU architecture", sub {
 					elsif ($model >= 3) { $arch = "prescott"; }
 					else { $arch = "pentium4"; }
 				} elsif ($family == 6 && $gccver >= 3003) {
-					if ($model == 15) { $arch = "prescott"; }
+					if ($model == 23) { $arch = "nocona"; }
+					elsif ($model == 15) { $arch = "prescott"; }
 					elsif (($model == 9 || $model == 13) && $gccver >= 3004) { $arch = "pentium-m"; }
 					elsif ($model >= 7) { $arch = "pentium3"; }
 					elsif ($model >= 3) { $arch = "pentium2"; }
@@ -243,6 +256,15 @@ if (IsSet("CONFIG_DARWIN")) {
 	Append("COPT" => "-I/sw/include");
 	# Fill in some constants not found in the system header files
 	Set("SOL_TCP" => 6);		# missing in /usr/include/netinet/tcp.h
+	if (IsGiven("CONFIG_DIRECT_IO") && IsSet("CONFIG_DIRECT_IO")) {
+		Fail("Direct I/O is not available on darwin");
+	} else {
+		UnSet("CONFIG_DIRECT_IO");
+	}
+	if (!IsSet("CONFIG_POSIX_REGEX") && !IsSet("CONFIG_PCRE")) {
+		Set("CONFIG_POSIX_REGEX" => 1);
+		Warn "BSD regex library on Darwin isn't compatible, using POSIX regex.\n";
+	}
 }
 
 ### Writing C headers with configuration ###