diff --git a/Makefile.am b/Makefile.am
index 911f30801..d423ada61 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -46,9 +46,15 @@ else
 init-state:
 endif
 
+init-ext3cow-header-hack:
+	@echo "Symlinking ext3cow header file into src"
+	ln -sf $(ext3cowheader) src/libext3cow/
+
 svn-revision:
 	svnversion . > svn-revision
 
+all: init-ext3cow-header-hack
+
 all-local: NEWS
 
 NEWS: doc/manual/NEWS.txt
diff --git a/configure.ac b/configure.ac
index a1b2f6b3b..048229cd8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,11 +169,6 @@ AC_ARG_WITH(store-state-dir, AC_HELP_STRING([--with-store-state-dir=PATH],
   storestatedir=$withval, storestatedir='${prefix}/state')
 AC_SUBST(storestatedir)
 
-AC_ARG_WITH(store-state-repos-dir, AC_HELP_STRING([--with-store-state-repos-dir=PATH],
-  [path of the Nix state store repository]),
-  storestatereposdir=$withval, storestatereposdir='${prefix}/staterepos')
-AC_SUBST(storestatereposdir)
-
 AC_ARG_WITH(bdb, AC_HELP_STRING([--with-bdb=PATH],
   [prefix of Berkeley DB]),
   bdb=$withval, bdb=)
@@ -188,11 +183,11 @@ fi
 AC_SUBST(bdb_lib)
 AC_SUBST(bdb_include)
 
-NEED_PROG(svn, svn)
-AC_ARG_WITH(svn-bin, AC_HELP_STRING([--with-svn-bin=PATH],
-  [path of svn, svnadmin]),
-  subversion=$withval, subversion=$(dirname $svn))
-AC_SUBST(subversion)
+AC_ARG_WITH(ext3cow-header, AC_HELP_STRING([--with-ext3cow-header=PATH],
+  [path of the header ext3cow header ext3cow_fs.h]),
+  ext3cowheader=$withval, ext3cowheader=)
+AC_SUBST(ext3cowheader)
+AC_CHECK_HEADER(${ext3cowheader})
 
 AC_ARG_WITH(aterm, AC_HELP_STRING([--with-aterm=PATH],
   [prefix of CWI ATerm library]),
diff --git a/corepkgs/buildenv/builder.pl.in b/corepkgs/buildenv/builder.pl.in
index bea619a40..ef8495144 100755
--- a/corepkgs/buildenv/builder.pl.in
+++ b/corepkgs/buildenv/builder.pl.in
@@ -13,7 +13,9 @@ mkdir "$out", 0755 || die "error creating $out";
 
 my $symlinks = 0;
 my %path_identifier;
-my $srcDirSlashes = 3;
+
+my $nixBinDir = $ENV{"nixBinDir"};
+my $nixStore = $ENV{"nixStore"};
 
 # For each activated package, create symlinks.
 
@@ -22,14 +24,9 @@ sub createLinks {
     
     #Lookup each $stateIdentifiers in $path_identifier
     #we strip $srcDir to its rootdir e.g. /nix/store/......./
-    my @srcDirParts = split /\// , $srcDir;
-    my $srcDirRoot = ""; 
-    my $srcDirCounter=1;
-    while ($srcDirCounter <= $srcDirSlashes) {
-       $srcDirRoot = $srcDirRoot . "/" . $srcDirParts[$srcDirCounter];
-       $srcDirCounter++;
-    }
-	#print "srcDirRoot $srcDirRoot \n";
+    my @srcDirParts = split /\// , substr($srcDir, length ($nixStore), length ($srcDir));
+    my $srcDirRoot = $nixStore . "/" . $srcDirParts[1];
+	# print "srcDirRoot $srcDirRoot \n";
     my $pkgStateIdentifier = $path_identifier{$srcDirRoot};
     
     my $dstDir = shift;
@@ -118,7 +115,7 @@ sub createLinks {
 		            
 		            sysopen (DSTFILEHANDLE, $new_dstFile, O_RDWR|O_EXCL|O_CREAT, 0755);
 					printf DSTFILEHANDLE "#! @shell@ \n";
-					printf DSTFILEHANDLE "/nixstate/nix/bin/nix-state --run --identifier=$new_stateIdentifier $srcFile \"\$@\" \n";		#TODO !!!!!!!!!! fix hard link
+					printf DSTFILEHANDLE "$nixBinDir/nix-state --run --identifier=$new_stateIdentifier $srcFile \"\$@\" \n";
 					close (DSTFILEHANDLE);
 	            }
             }
diff --git a/corepkgs/buildenv/default.nix b/corepkgs/buildenv/default.nix
index 9f5a12f8b..7b6c81263 100644
--- a/corepkgs/buildenv/default.nix
+++ b/corepkgs/buildenv/default.nix
@@ -1,4 +1,4 @@
-{system, derivations, stateIdentifiers, manifest}:
+{system, derivations, stateIdentifiers, manifest, nixBinDir, nixStore}:
 
 derivation { 
   name = "user-environment";
@@ -7,4 +7,5 @@ derivation {
   derivations = derivations;
   stateIdentifiers = stateIdentifiers;
   manifest = manifest;
+  inherit nixBinDir nixStore;
 }
diff --git a/install_full.sh b/install_full.sh
index c18a10032..9cc626663 100755
--- a/install_full.sh
+++ b/install_full.sh
@@ -19,6 +19,7 @@ if [ "$1" = "full" ]; then
   nix-env-all-pkgs.sh -i docbook5-xsl
   nix-env-all-pkgs.sh -i bison
   nix-env-all-pkgs.sh -i gdb			#optional for debugging
+  nix-env-all-pkgs.sh -i e3cfsprogs
 fi
 
 if [ "$1" = "full" ] || [ "$1" = "auto" ]; then
@@ -42,8 +43,8 @@ fi
             --with-docbook-xsl=/root/.nix-profile/xml/xsl/docbook \
             --prefix=$nixstatepath \
             --with-store-dir=/nix/store \
-	    --with-store-state-dir=/nix/state \
-            --with-store-state-repos-dir=/nix/staterepos \
+	    	--with-store-state-dir=/nix/state \
+            --with-ext3cow-header=/nix/store/8nirllv1w6qv6c5srjgah2m82bfi1d6k-linux-2.6.21.5/lib/modules/2.6.21.5-default/build/include/linux/ext3cow_fs.h \
             --localstatedir=/nix/var
 
 
diff --git a/scripts/nix-pull.in b/scripts/nix-pull.in
index 5633204e1..db0594040 100644
--- a/scripts/nix-pull.in
+++ b/scripts/nix-pull.in
@@ -24,11 +24,8 @@ $storeDir = "@storedir@" unless defined $storeDir;
 my $storeStateDir = $ENV{"NIX_STORE_STATE_DIR"};
 $storeStateDir = "@storestatedir@" unless defined $storeStateDir;
 
-my $storeStateReposDir = $ENV{"NIX_STORE_STATE_REPOS_DIR"};
-$storeStateReposDir = "@storestatereposdir@" unless defined $storeStateReposDir;
-
-my $subversion = $ENV{"NIX_SVN_BIN_DIR"};
-$subversion = "@subversion@" unless defined $subversion;
+my $ext3cowheader = $ENV{"NIX_EXT3_COW_HEADER"};
+$ext3cowheader = "@ext3cowheader@" unless defined $ext3cowheader;
 
 # Prevent access problems in shared-stored installations.
 umask 0022;
diff --git a/src/libext3cow/Makefile.am b/src/libext3cow/Makefile.am
index 8b9b7a1df..71edc287d 100644
--- a/src/libext3cow/Makefile.am
+++ b/src/libext3cow/Makefile.am
@@ -1,6 +1,6 @@
 pkglib_LTLIBRARIES = libext3cow.la
 
-libext3cow_la_SOURCES = epoch2date.c snapshot.cc tt.c ext3cow_tools.h
+libext3cow_la_SOURCES = epoch2date.c snapshot.cc tt.c ext3cow_tools.h ext3cow_fs.h
 
 pkginclude_HEADERS = snapshot.hh
 
@@ -14,4 +14,4 @@ AM_CXXFLAGS = -Wall \
  -I$(srcdir)/../libutil
 
 AM_CFLAGS = \
- ${aterm_include}
\ No newline at end of file
+ ${aterm_include}
diff --git a/src/libext3cow/ext3cow_tools.h b/src/libext3cow/ext3cow_tools.h
index 8feade595..43bb32dd3 100644
--- a/src/libext3cow/ext3cow_tools.h
+++ b/src/libext3cow/ext3cow_tools.h
@@ -7,4 +7,4 @@
 #include <sys/ioctl.h>
 #include <time.h>
 #include <sys/time.h>
-#include </nix/store/8nirllv1w6qv6c5srjgah2m82bfi1d6k-linux-2.6.21.5/lib/modules/2.6.21.5-default/build/include/linux/ext3cow_fs.h>
+#include "ext3cow_fs.h"
diff --git a/src/libmain/Makefile.am b/src/libmain/Makefile.am
index dd1455df8..2effd36c4 100644
--- a/src/libmain/Makefile.am
+++ b/src/libmain/Makefile.am
@@ -5,8 +5,7 @@ libmain_la_SOURCES = shared.cc shared.hh
 AM_CXXFLAGS = \
  -DNIX_STORE_DIR=\"$(storedir)\" \
  -DNIX_STORE_STATE_DIR=\"$(storestatedir)\" \
- -DNIX_STORE_STATE_REPOS_DIR=\"$(storestatereposdir)\" \
- -DNIX_SVN_BIN_DIR=\"$(subversion)\" \
+ -DNIX_EXT3_COW_HEADER=\"$(ext3cowheader)\" \
  -DNIX_DATA_DIR=\"$(datadir)\" \
  -DNIX_STATE_DIR=\"$(localstatedir)/nix\" \
  -DNIX_LOG_DIR=\"$(localstatedir)/log/nix\" \
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index e8dac1a63..672c6a0d4 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -92,7 +92,7 @@ static void initAndRun(int argc, char * * argv)
     nixLogDir = canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR));
     nixStateDir = canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR));									//nix global state dir
     nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
-    nixSVNPath = getEnv("NIX_SVN_BIN_DIR", NIX_SVN_BIN_DIR);
+    nixExt3CowHeader = getEnv("NIX_EXT3_COW_HEADER", NIX_EXT3_COW_HEADER);
     nixConfDir = canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR));
     nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
     nixBinDir = canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR));
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index a39d6e0cc..980bd367f 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -14,7 +14,7 @@ string nixDataDir = "/UNINIT";
 string nixLogDir = "/UNINIT";
 string nixStateDir = "/UNINIT";
 string nixDBPath = "/UNINIT";
-string nixSVNPath = "/UNINIT";
+string nixExt3CowHeader = "/UNINIT";
 string nixConfDir = "/UNINIT";
 string nixLibexecDir = "/UNINIT";
 string nixBinDir = "/UNINIT";
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index bb4c4019b..fc3b1a78d 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -27,8 +27,8 @@ extern string nixStateDir;
 /* nixDBPath is the path name of our Berkeley DB environment. */
 extern string nixDBPath;
 
-/* nixSVNPath is the path name of our SVN environment. */
-extern string nixSVNPath;
+/* nixExt3CowHeader is the header file used to communicate with ext3cow. */
+extern string nixExt3CowHeader;
 
 /* nixConfDir is the directory where configuration files are
    stored. */
diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc
index 86d526afa..5deae1792 100644
--- a/src/nix-env/nix-env.cc
+++ b/src/nix-env/nix-env.cc
@@ -212,7 +212,7 @@ static void createUserEnv(EvalState & state, const DrvInfos & elems,
        it for future modifications of the environment. */
     Path manifestFile = store->addTextToStore("env-manifest", atPrint(canonicaliseExpr(makeList(ATreverse(manifest)))), references);
 
-    Expr topLevel = makeCall(envBuilder, makeAttrs(ATmakeList4(
+    Expr topLevel = makeCall(envBuilder, makeAttrs(ATmakeList6(
         makeBind(toATerm("system"),
             makeStr(thisSystem), makeNoPos()),
         makeBind(toATerm("derivations"),
@@ -220,7 +220,11 @@ static void createUserEnv(EvalState & state, const DrvInfos & elems,
         makeBind(toATerm("stateIdentifiers"),
             makeList(ATreverse(stateIdentifiers)), makeNoPos()),
         makeBind(toATerm("manifest"),
-            makeStr(manifestFile, singleton<PathSet>(manifestFile)), makeNoPos())
+            makeStr(manifestFile, singleton<PathSet>(manifestFile)), makeNoPos()),
+        makeBind(toATerm("nixBinDir"),
+            makeStr(nixBinDir), makeNoPos()),
+        makeBind(toATerm("nixStore"),
+            makeStr(nixStore), makeNoPos())
         )));
 
     /* Instantiate it. */
diff --git a/src/nix-state/nix-state.cc b/src/nix-state/nix-state.cc
index 79aec3afe..6a8fba675 100644
--- a/src/nix-state/nix-state.cc
+++ b/src/nix-state/nix-state.cc
@@ -481,9 +481,6 @@ static void opRunComponent(Strings opFlags, Strings opArgs)
     //WARNING: we need to watch out for deadlocks!
 	//add locks ... ?
 	//svn lock ... ?
-
-    //TODO maybe also scan the parameters for state or component hashes?
-    //program_args
 	
 	//TODO
 	Transaction txn;
@@ -501,6 +498,9 @@ static void opRunComponent(Strings opFlags, Strings opArgs)
     			printMsg(lvlError, format("%1%") % padd("", '-', 100));
     		//printMsg(lvlError, format("ARG %1%") % *i);
     		root_args += " \"" + *i + "\"";
+    		
+    		//TODO also scan the parameters for state or component hashes?
+    		//program_args
     	}
     	
     	printMsg(lvlError, format("Command: '%1%'")	% (root_componentPath + root_binary + root_args));
@@ -689,9 +689,10 @@ void run(Strings args)
 		printMsg(lvlError, format("P: '%1%'") % *j );
 	return;
 
-	//	*/
-	
-	
+	printMsg(lvlError, format("header: '%1%'") % nixExt3CowHeader);
+	return;
+
+	*/		
 	
 	/* test */