diff --git a/packages/numlib/metis/5.1.0 b/packages/numlib/metis/5.1.0
new file mode 100755
index 0000000..295e6e5
--- /dev/null
+++ b/packages/numlib/metis/5.1.0
@@ -0,0 +1,48 @@
+#!/bin/sh
+# sit class file
+#
+# Christoph Niethammer <niethammer@hlrs.de> (C) 2012
+#
+
+CATEGORY="numlib"
+PACKAGE="metis"
+VERSION="5.1.0"
+URL="http://glaros.dtc.umn.edu/gkhome/metis/metis/overview"
+INSTALLER="Elke Flehmig <flehmig@hlrs.de>"
+
+# cmake 2.8 or higher is required
+case $PLATFORM in
+   hermit|hermit1)
+       module load tools/cmake/2.8.10
+       module swap PrgEnv-cray PrgEnv-gnu
+   ;;
+   laki)
+       module load tools/cmake/2.8.11.1
+   ;;
+esac
+
+# Archive A and package name P
+A=${PACKAGE}-${VERSION}.tar.gz
+P=${PACKAGE}-${VERSION}
+
+BUILDDIR=$SRCDIR
+
+src_prepare() {
+#       set 64bit width for elementary data types
+        sit_info "patching metis.h with 64bit width"
+        cd $SRCDIR/include
+        patch metis.h < $SRC_POOL/5.1.0_metis.h_patch
+}
+
+src_configure() {
+        make config prefix=$PREFIX
+}
+
+src_install() {
+        make install
+
+#       mv manual to target (not included in make install)
+        sit_info "Installing manual"
+        cd $SRCDIR/manual; mv manual.pdf $PREFIX
+}
+
diff --git a/packages/numlib/metis/5.1.0_metis.h_patch b/packages/numlib/metis/5.1.0_metis.h_patch
new file mode 100755
index 0000000..443373f
--- /dev/null
+++ b/packages/numlib/metis/5.1.0_metis.h_patch
@@ -0,0 +1,8 @@
+33c33
+< #define IDXTYPEWIDTH 32
+---
+> #define IDXTYPEWIDTH 64
+43c43
+< #define REALTYPEWIDTH 32
+---
+> #define REALTYPEWIDTH 64
diff --git a/packages/numlib/parmetis/4.0.3 b/packages/numlib/parmetis/4.0.3
new file mode 100755
index 0000000..63fdc56
--- /dev/null
+++ b/packages/numlib/parmetis/4.0.3
@@ -0,0 +1,55 @@
+#!/bin/sh
+# sit class file
+#
+# Christoph Niethammer <niethammer@hlrs.de> (C) 2012
+#
+
+CATEGORY="numlib"
+PACKAGE="parmetis"
+VERSION="4.0.3"
+URL="http://glaros.dtc.umn.edu/gkhome/metis/parmetis/download"
+INSTALLER="Elke Flehmig <flehmig@hlrs.de>"
+
+# cmake 2.8 or higher is required
+case $PLATFORM in
+   hermit|hermit1)
+       module load tools/cmake/2.8.10
+   ;;
+   laki)
+       module load tools/cmake/2.8.11.1
+   ;;
+esac
+
+# Archive A and package name P
+A=${PACKAGE}-${VERSION}.tar.gz
+P=${PACKAGE}-${VERSION}
+
+BUILDDIR=$SRCDIR
+
+src_prepare() {
+#       set 64bit width for elementary data types
+        sit_info "patching metis.h with 64bit width"
+        cd $SRCDIR/metis/include
+        patch metis.h < $SRC_POOL/4.0.3_metis.h_patch
+
+#       on cray, replace mpicc and mpicxx with cray mpi compiler commands
+        case $PLATFORM in
+           hermit|hermit1)
+               sit_info "patching Makefile with cray mpi compiler on hermit"
+               cd $SRCDIR
+               patch Makefile < $SRC_POOL/4.0.3_Makefile_patch_cray
+        ;;
+        esac
+}
+
+src_configure() {
+        make config prefix=$PREFIX
+}
+
+src_install() {
+        make install
+
+#       mv manual to target (not included in make install)
+        sit_info "Installing manual"
+        cd $SRCDIR/manual; mv manual.pdf $PREFIX
+}
diff --git a/packages/numlib/parmetis/4.0.3_Makefile_patch_cray b/packages/numlib/parmetis/4.0.3_Makefile_patch_cray
new file mode 100755
index 0000000..0633c8d
--- /dev/null
+++ b/packages/numlib/parmetis/4.0.3_Makefile_patch_cray
@@ -0,0 +1,6 @@
+11,12c11,12
+< cc         = mpicc
+< cxx        = mpicxx
+---
+> cc         = cc
+> cxx        = CC
diff --git a/packages/numlib/parmetis/4.0.3_metis.h_patch b/packages/numlib/parmetis/4.0.3_metis.h_patch
new file mode 100755
index 0000000..443373f
--- /dev/null
+++ b/packages/numlib/parmetis/4.0.3_metis.h_patch
@@ -0,0 +1,8 @@
+33c33
+< #define IDXTYPEWIDTH 32
+---
+> #define IDXTYPEWIDTH 64
+43c43
+< #define REALTYPEWIDTH 32
+---
+> #define REALTYPEWIDTH 64
diff --git a/packages/numlib/petsc/3.4.0 b/packages/numlib/petsc/3.4.0
new file mode 100755
index 0000000..b695cae
--- /dev/null
+++ b/packages/numlib/petsc/3.4.0
@@ -0,0 +1,59 @@
+#!/bin/sh
+# sit class file
+#
+# Christoph Niethammer <niethammer@hlrs.de> (C) 2012
+#
+
+CATEGORY="numlib"
+PACKAGE="petsc"
+VERSION="3.4.0"
+URL="http://www.mcs.anl.gov/petsc/"
+INSTALLER="Elke Flehmig <flehmig@hlrs.de>"
+
+#module load tools/cmake/2.8.11.1
+
+# Archive A and package name P
+A=${PACKAGE}-${VERSION}.tar.gz
+P=${PACKAGE}-${VERSION}
+
+
+# our petsc default config: 32bit real double precision
+# blas_lapack: with intel compiler, use intel's mkl instead
+case $COMPILER in
+	gnu)
+		ARCH=linux-gnu
+                BLAS_LAPACK="--download-f-blas-lapack=$SRC_POOL/fblaslapack-3.1.1.tar.gz"
+	;;
+	intel)
+		ARCH=linux-gnu-intel
+                module load numlib/intel/mkl/11.0
+                BLAS_LAPACK="--with-blas-lapack-dir=/opt/compiler/intel/composer_xe_2013-2-146/composer_xe_2013/mkl/lib/intel64"
+	;;
+esac
+
+# Other interesting configure options:
+# --enable-mpi-threads
+# --enable-progress-threads
+
+CONFIGURE_OPTS="
+   --CC=$MPICC --CXX=$MPICXX --FC=$MPIFC \
+   --with-mpiexec=mpirun \
+   PETSC_ARCH=$ARCH \
+   --with-clanguage=cxx \
+   --with-c-support \
+   --with-fortran-datatypes=1 \
+   $BLAS_LAPACK \
+   "
+
+# default is make -j, which doesn't work here!
+#(petsc automatically builds parallel)
+MAKEOPTS=""
+
+BUILDDIR=$SRCDIR
+
+src_prepare() {
+    export PETSC_DIR=${SRCDIR}
+}
+src_pretest() {
+    make PETSC_DIR=$SRCDIR PETSC_ARCH=$ARCH test
+}