diff --git a/misc/config/config-200-defaults.in b/misc/config/config-200-defaults.in
index c653d4930..66d57b9ec 100644
--- a/misc/config/config-200-defaults.in
+++ b/misc/config/config-200-defaults.in
@@ -2,13 +2,34 @@
 
 comment ' '
 menu_begin MENU_DEFAULTS 'Package Defaults'
+	comment 'Default Linux headers'
+	block_begin 3
+		choice ROCKCFG_PKG_LINUX_DEFAULT_HEADERS linux26-headers \
+						$CFGTEMP_LINUX_HEADERS
+	block_end
+
+	if [ "$ROCKCFG_PKG_LINUX_DEFAULT_HEADERS" == linux24-headers ] ; then
+		pkgenable linux24-headers
+		pkgremove linux26-headers
+		pkgremove linux-libc-headers
+	elif [ "$ROCKCFG_PKG_LINUX_DEFAULT_HEADERS" == linux26-headers ] ; then
+		pkgremove linux24-headers
+		pkgenable linux26-headers
+		pkgremove linux-libc-headers
+	elif [ "$ROCKCFG_PKG_LINUX_DEFAULT_HEADERS" == linux-libc-headers ] ; then
+		pkgremove linux24-headers
+		pkgremove linux26-headers
+		pkgenable linux-libc-headers
+	fi
+
+	comment ' '
 	comment "Default compilers"
 	block_begin 3
 		choice ROCKCFG_DEFAULT_CC gcc42 $CFGTEMP_DEFAULT_CC
 		choice ROCKCFG_DEFAULT_KCC gcc42 $CFGTEMP_DEFAULT_KCC
-		choice ROCKCFG_DEFAULT_CXX gcc42 $CFGTEMP_DEFAULT_CXX
-		choice ROCKCFG_DEFAULT_F77 gcc42 $CFGTEMP_DEFAULT_F77
-		choice ROCKCFG_DEFAULT_F95 gcc42 $CFGTEMP_DEFAULT_F95
+		choice ROCKCFG_DEFAULT_CXX gcc42 $CFGTEMP_DEFAULT_CXX 'none' 'No_default_C++_compiler'
+		choice ROCKCFG_DEFAULT_F77 gcc42 $CFGTEMP_DEFAULT_F77 'none' 'No_default_Fortran_77_compiler'
+		choice ROCKCFG_DEFAULT_F95 gcc42 $CFGTEMP_DEFAULT_F95 'none' 'No_default_Fortran_95_compiler'
 	
 		pkgenable $ROCKCFG_DEFAULT_CC
 		pkgenable $ROCKCFG_DEFAULT_KCC
@@ -17,13 +38,18 @@ menu_begin MENU_DEFAULTS 'Package Defaults'
 		pkgenable $ROCKCFG_DEFAULT_F95
 	block_end
 
-	# build non-default CCs in stages 5 and 9
-	# and dedicated C++ and Fortran77 compilers in stages 2 and 9
+	# Build non-default CCs in stages 5 and 9
+	# and dedicated C++ and Fortran77 compilers in stages 2 and 9.
+	# Also remove CORE flag from non-default compilers.
 	k=""; for x in $CFGTEMP_DEFAULT_CC $CFGTEMP_DEFAULT_CXX $CFGTEMP_DEFAULT_F77 ; do
 		if [ "$ROCKCFG_DEFAULT_CC" != "$x" ] ; then
 			if [[ "$ROCKCFG_DEFAULT_CXX" != "$x" && \
-			      "$ROCKCFG_DEFAULT_F77" != "$x" ]]; then
-				k="$k /[ =]$x /   s/^\(.\) [0-9-]*/\1 -----5---9/;";
+			       "$ROCKCFG_DEFAULT_F77" != "$x" ]]; then
+				k="$k /[ =]$x / s/^\(.\) [0-9-]*/\1 -----5---9/;"
+				if [[ "$ROCKCFG_DEFAULT_KCC" != "$x" && \
+				       "$ROCKCFG_DEFAULT_F95" != "$x" ]] ; then
+					k="$k /[ =]$x / s/\(.*\) CORE \(.*\)/\1 \2/;"
+				fi
 			else
 				k="$k /[ =]$x /   s/^\(.\) [0-9-]*/\1 --2------9/;"
 			fi
diff --git a/package/base/bash/preconfig.in b/package/base/bash/preconfig.in
index 0d9635cb9..c4dced449 100644
--- a/package/base/bash/preconfig.in
+++ b/package/base/bash/preconfig.in
@@ -20,6 +20,6 @@
 # 
 # --- ROCK-COPYRIGHT-NOTE-END ---
 
-pkgfork bash bash2
-pkgfork bash bash3
+pkgfork bash bash2 
+pkgfork bash bash3 unflag CORE
 pkgremove bash
diff --git a/package/base/bdb/subconfig-libs.in b/package/base/bdb/subconfig-libs.in
index 0c819e44c..d10c8689d 100644
--- a/package/base/bdb/subconfig-libs.in
+++ b/package/base/bdb/subconfig-libs.in
@@ -20,35 +20,34 @@
 # 
 # --- ROCK-COPYRIGHT-NOTE-END ---
 
-if pkgcheck bdb=bdb33 X || pkgcheck bdb=bdb40 X || pkgcheck bdb=bdb41 X \
-	|| pkgcheck bdb=bdb42 X || pkgcheck bdb=bdb44 X
+if pkgcheck "bdb=.*" .
 then
 	menu_begin MENU_PKG_BDB 'BerkleyDB Options'
 	block_begin 4
 
 	# we choose to select the newest bdb available as default
-	if pkgcheck bdb=bdb33 X ; then
+	if pkgcheck bdb=bdb33 . ; then
 		bdbdefselect="$bdbdefselect bdb33 'Using v3.3 as default'"
 		bdbdefault="bdb33";
 	fi;
-	if pkgcheck bdb=bdb40 X ; then 
+	if pkgcheck bdb=bdb40 . ; then 
 		bdbdefselect="$bdbdefselect bdb40 'Using v4.0 as default'"
 		bdbdefault="bdb40";
 	fi
-	if pkgcheck bdb=bdb41 X ; then 
+	if pkgcheck bdb=bdb41 . ; then 
 		bdbdefselect="$bdbdefselect bdb41 'Using v4.1 as default'"
 		bdbdefault="bdb41";
 	fi
-	if pkgcheck bdb=bdb42 X ; then 
+	if pkgcheck bdb=bdb42 . ; then 
 		bdbdefselect="$bdbdefselect bdb42 'Using v4.2 as default'"
 		bdbdefault="bdb42";
 	fi
-	if pkgcheck bdb=bdb44 X ; then 
+	if pkgcheck bdb=bdb44 . ; then 
 		bdbdefselect="$bdbdefselect bdb44 'Using v4.4 as default'"
 		bdbdefault="bdb44";
 	fi
 
-	eval "choice ROCKCFG_PKG_BDB_DEFAULT $bdbdefault $bdbdefselect"
+	eval "choice ROCKCFG_PKG_BDB_DEFAULT $bdbdefault $bdbdefselect none No_default_BerkleyDB"
 
 	block_end
 	menu_end
diff --git a/package/base/gcc/preconfig.in b/package/base/gcc/preconfig.in
index f816df85a..b9d3c2671 100644
--- a/package/base/gcc/preconfig.in
+++ b/package/base/gcc/preconfig.in
@@ -1,6 +1,6 @@
 #!/bin/bash	
 for x in gcc2 gcc32 gcc33 gcc34 gcc40 gcc41 gcc42 ; do
-	pkgfork gcc $x status O
+	pkgfork gcc $x
 	CFGTEMP_DEFAULT_CC="$x Use_${x}_as_default_C_compiler $CFGTEMP_DEFAULT_CC"
 	CFGTEMP_DEFAULT_KCC="$x Use_${x}_as_default_kernel_compiler $CFGTEMP_DEFAULT_KCC"
 	CFGTEMP_DEFAULT_CXX="$x Use_${x}_as_default_C++_compiler $CFGTEMP_DEFAULT_CXX"
diff --git a/package/base/linux-libc-headers/preconfig.in b/package/base/linux-libc-headers/preconfig.in
new file mode 100644
index 000000000..8a417ab7b
--- /dev/null
+++ b/package/base/linux-libc-headers/preconfig.in
@@ -0,0 +1 @@
+CFGTEMP_LINUX_HEADERS="$CFGTEMP_LINUX_HEADERS linux-libc-headers Use_linux-libc-headers_as_Linux_headers"
diff --git a/package/base/linux/config-500.in b/package/base/linux/config-500.in
index bc763dc56..2313710c8 100644
--- a/package/base/linux/config-500.in
+++ b/package/base/linux/config-500.in
@@ -20,7 +20,7 @@
 # 
 # --- ROCK-COPYRIGHT-NOTE-END ---
 
-if pkgcheck "linux=.*" X
+if pkgcheck "linux=.*" .
 then
   menu_begin MENU_PKG_LINUX 'Linux Kernel Options'
 
@@ -29,6 +29,8 @@ then
 
 	if [ "$ROCKCFG_PKG_LINUX_SRC24" = 0 ]; then
 		pkgdisable linux=linux24-source
+	else
+		pkgenable linux=linux24-source
 	fi
 
 	bool 'Place linux26 sources in /usr/src' \
@@ -36,6 +38,8 @@ then
 
 	if [ "$ROCKCFG_PKG_LINUX_SRC26" = 0 ]; then
 		pkgdisable linux=linux26-source
+	else
+		pkgenable linux=linux26-source
 	fi
 
 	bool 'Build and install a linux24 kernel' \
@@ -43,6 +47,8 @@ then
 
 	if [ "$ROCKCFG_PKG_LINUX_IMG24" = 0 ]; then
 		pkgdisable linux=linux24
+	else
+		pkgenable linux=linux24
 	fi
 
 	bool 'Build and install a linux26 kernel' \
@@ -50,6 +56,8 @@ then
 
 	if [ "$ROCKCFG_PKG_LINUX_IMG26" = 0 ]; then
 		pkgdisable linux=linux26
+	else
+		pkgenable linux=linux26
 	fi
 
 	case "$ROCKCFG_PKG_LINUX_IMG24$ROCKCFG_PKG_LINUX_IMG26" in
@@ -69,10 +77,6 @@ then
 		;;
 	esac
 
-	choice ROCKCFG_PKG_LINUX_DEFAULT_HEADERS linux26 \
-		linux26 'Use Linux 2.6 headers as system headers' \
-		linux-libc 'Use linux-libc-headers package as system headers'
-
 	choice ROCKCFG_PKG_LINUX_CONFIG_STYLE modules \
 		none 'Do not perform any automatic kernel configuration' \
 		nomodules 'Perform normal kernel configuration without modules' \
diff --git a/package/base/linux/postconfig.in b/package/base/linux/postconfig.in
deleted file mode 100644
index ee5cbd86c..000000000
--- a/package/base/linux/postconfig.in
+++ /dev/null
@@ -1,13 +0,0 @@
-if [ "$ROCKCFG_PKG_LINUX_DEFAULT_HEADERS" == linux24 ] ; then
-	pkgenable linux24-headers
-	pkgremove linux26-headers
-	pkgremove linux-libc-headers
-elif [ "$ROCKCFG_PKG_LINUX_DEFAULT_HEADERS" == linux26 ] ; then
-	pkgremove linux24-headers
-	pkgenable linux26-headers
-	pkgremove linux-libc-headers
-elif [ "$ROCKCFG_PKG_LINUX_DEFAULT_HEADERS" == linux-libc ] ; then
-	pkgremove linux24-headers
-	pkgremove linux26-headers
-	pkgenable linux-libc-headers
-fi
diff --git a/package/base/linux/preconfig.in b/package/base/linux/preconfig.in
index 80959ba57..4a77b059d 100644
--- a/package/base/linux/preconfig.in
+++ b/package/base/linux/preconfig.in
@@ -5,4 +5,4 @@ pkgfork linux linux26-source stages -X---5---9
 pkgfork linux linux26-headers stages 01-------9 priority 100.200
 pkgremove linux
 
-CFGTEMP_LINUX_HEADERS="$CFGTEMP_LINUX_HEADERS linux26-headers"
+CFGTEMP_LINUX_HEADERS="$CFGTEMP_LINUX_HEADERS linux26-headers Use_Linux_2.6_as_Linux_headers"
diff --git a/scripts/Config b/scripts/Config
index 84e1736ad..5e9c62599 100755
--- a/scripts/Config
+++ b/scripts/Config
@@ -171,17 +171,11 @@ if expr "`uname -m`" : "powerpc" > /dev/null ; then arch=powerpc ; fi
 if expr "`uname -m`" : "sparc"   > /dev/null ; then arch=sparc   ; fi
 if expr "`uname -m`" : "mips"    > /dev/null ; then arch=mips    ; fi
 
-export CFGTEMP_ARCH="$arch"
-export CFGTEMP_ID="$rockver"
 export ROCKCFG_EXPERT=0
 
 . $swpdir/config
 . $swpdir/config_usr
 
-include "architecture/*/preconfig.in"
-include "misc/*/preconfig.in"
-include "target/*/preconfig.in"
-
 old_pkg_cmd=""
 do_config_cycle=1
 recreate_packages=1
@@ -201,21 +195,14 @@ while [ "$do_config_cycle" == 1 ] ; do
 		else
 			eval "./scripts/Create-PkgList $pkg_cmd" \
 				> $swpdir/packages
-			pkgin
-			if [ ! -e "$swpdir/preconfig.in.tmp" ] ; then
-				cat package/*/*/preconfig.in | grep -v "^#" \
-					> "$swpdir/preconfig.in.tmp"
-			fi
-			include "$swpdir/preconfig.in.tmp"
-			pkgout
 			cp -a "$swpdir/packages" "$pkg_cache"
 		fi
 		old_pkg_cmd="$pkg_cmd"
 	else
 		cp -a "$pkg_cache" "$swpdir/packages"
-		pkgin
 	fi
 
+	pkgin
 	rm -f $swpdir/config.{dialog,data,help}{,.*}
 	
 	config_cycle
@@ -225,20 +212,10 @@ while [ "$do_config_cycle" == 1 ] ; do
 
 	. scripts/config.in
 
-	if [ ! -e "$swpdir/postconfig.in.tmp" ] ; then
-		{
-		ls misc/*/postconfig{,-*}.in 2>/dev/null \
-			| LC_ALL=C sort -k3,3 -t"/" | tr '\n' ' ' | xargs cat
-		cat package/*/*/postconfig.in
-		} | grep -v "^#" > "$swpdir/postconfig.in.tmp"
-	fi
-	include "$swpdir/postconfig.in.tmp"
-	include architecture/$ROCKCFG_ARCH/postconfig.in
-	include target/$ROCKCFG_TARGET/postconfig.in
-
 	bprof rockconfig stop
 	bprof main start
-	
+
+	pkgout
 	configtitle="$(printf ' %-50s %6s active packages ]' \
 		"ROCK Linux $rockver Configuration - $config" \
 		"[ $(echo `grep '^X' $swpdir/packages | wc -l`)" )"
diff --git a/scripts/config.in b/scripts/config.in
index c8e333699..4008729a9 100644
--- a/scripts/config.in
+++ b/scripts/config.in
@@ -70,11 +70,23 @@
 # Config Presets: ROCKCFGSET_*
 #
 
+unset ${!CFGTEMP_*}
+
+if [ ! -e "$swpdir/preconfig.in.tmp" ] ; then
+	grep -h -v "^#" architecture/*/preconfig.in \
+		misc/*/preconfig.in \
+		target/*/preconfig.in \
+		package/*/*/preconfig.in \
+	2> /dev/null > "$swpdir/preconfig.in.tmp"
+fi
+include "$swpdir/preconfig.in.tmp"
+
 comment_id '- Architecture, CPU and Optimization' COMMENT_ARCHCPUOPT
 
 block_begin 7
-	choice ROCKCFG_ARCH $CFGTEMP_ARCH $CFGTEMP_ARCHLIST
+	choice ROCKCFG_ARCH $arch $CFGTEMP_ARCHLIST
 
+	ROCKCFG_ID="$rockver-$ROCKCFG_ARCH"
 	if [ -f architecture/$ROCKCFG_ARCH/config.in ]
 	then . architecture/$ROCKCFG_ARCH/config.in ; fi
 	    expert_begin
@@ -245,8 +257,8 @@ block_end
 
 if [ ! -e "$swpdir/config.in.tmp" ] ; then
 	ls package/*/*/config{,-*}.in ./misc/*/config{,-*}.in | \
-		LC_ALL=C sort -k4,4 -t"/" | tr '\n' ' ' | xargs cat | \
-		grep -v "^#" > "$swpdir/config.in.tmp"
+		LC_ALL=C sort -k4,4 -t"/" | \
+	xargs grep -h -v "^#" 2> /dev/null > "$swpdir/config.in.tmp"
 fi
 include "$swpdir/config.in.tmp"
 expert_end
@@ -281,9 +293,9 @@ var_append filterscript ' ' '/^[XO] --* / d ;'
 
 pkgfilter sed -e "$filterscript"
 
-ROCKCFG_ID="$CFGTEMP_ID-$ROCKCFG_ARCH-$ROCKCFG_TARGET"
 [ "$ROCKCFG_CROSSBUILD" = 1 ] && ROCKCFG_ID="$ROCKCFG_ID-cross"
 [ "$ROCKCFG_PSEUDONATIVE" = 1 ] && ROCKCFG_ID="$ROCKCFG_ID-pseudonative"
+ROCKCFG_ID="$ROCKCFG_ID-$ROCKCFG_TARGET"
 [ $ROCKCFG_EXPERT == 1 ] && ROCKCFG_ID="$ROCKCFG_ID-expert"
 [ "$ROCKCFG_IDCKSUM" = 1 ] && \
 	ROCKCFG_ID="`echo $ROCKCFG_ID | cksum | cut -f1 -d' '`"  
@@ -292,3 +304,14 @@ const ROCKCFG_SHORTID "$ROCKCFG_ID"
 
 ROCKCFG_ID="$config-$ROCKCFG_ID"
 const ROCKCFG_ID "$ROCKCFG_ID"
+
+if [ ! -e "$swpdir/postconfig.in.tmp" ] ; then
+	{
+	ls misc/*/postconfig{,-*}.in 2>/dev/null \
+		| LC_ALL=C sort -k3,3 -t"/"
+	ls package/*/*/postconfig.in
+	} | xargs grep -h -v "^#" 2> /dev/null > "$swpdir/postconfig.in.tmp"
+fi
+include "$swpdir/postconfig.in.tmp"
+include architecture/$ROCKCFG_ARCH/postconfig.in
+include target/$ROCKCFG_TARGET/postconfig.in