Added libexpat 2.2.6

libexpat-2.2.6.md

+# Installation instructions
+
+## Download Source
+
+First download the source into directory `$DIR` (placeholder for the directory of your choice).
+
+```bash
+cd $DIR
+wget https://github.com/libexpat/libexpat/archive/R_2_2_6.tar.gz
+tar -xzf R_2_2_6.tar.gz
+```
+
+## Reconfigure with NEC-falvoured autotools
+
+Trigger the autotools reconfiguration process. Unfortunately, the nec-flavoured autotools are installed only on the vector nodes. Hence, we need to run an interactive job on a vector node to do the job:
+
+```bash
+# start insteractive job
+qlogin -q veinteractive -l elapstim_req=1800
+
+# get autoreconf into PATH
+export PATH="/opt/nec/ve/bin:$PATH"
+
+cd $DIR/libexpat-R_2_2_6/expat
+./buildconf.sh
+exit
+```
+
+## Build and install
+
+On the front-end, we can now cross-compile. Remember to replace `$PREFIX` with your installation directory.
+
+```bash
+# configure the package
+./configure \
+CC=ncc CFLAGS=-O3 CXX=nc++ FC=nfort F90=nfort AR=nar RANLIB=nranlib LD=nld \
+--host=ve-nec-linux-gnu --prefix=$PREFIX
+
+# buld and install library
+make -C lib all install
+```
+
+To test the library, you have to start an interactive job
+
+```bash
+# start insteractive job
+qlogin -q veinteractive -l elapstim_req=1800
+
+cd $DIR/libexpat-R_2_2_6/expat
+make -C tests check
+exit
+```