Added udunits-2.2.26

udunits-2.2.26.md

+# Installation instructions
+
+## Prerequisites
+You need to have libexpat installed in `$EXPAT_DIR`. See [UDUNITS documentation](https://www.unidata.ucar.edu/software/udunits/udunits-current/doc/udunits/udunits2.html#Prerequisites) for details.
+
+## Download Source
+
+First download the source into directory `$DIR` (placeholder for the directory of your choice).
+
+```bash
+cd $DIR
+wget wget ftp://ftp.unidata.ucar.edu/pub/udunits/udunits-2.2.26.tar.gz
+tar -xzf udunits-2.2.26.tar.gz
+
+# Fix autoconf scripts for SX AURORA
+cd udunits-2.2.26/build-aux
+rm config.sub config.guess
+wget \
+https://raw.githubusercontent.com/SX-Aurora/autoconf-helper/master/config.guess \
+https://raw.githubusercontent.com/SX-Aurora/autoconf-helper/master/config.sub
+```
+
+## Build and install
+
+On the front-end, we can cross-compile. Remember to replace `$PREFIX` with your installation directory.
+
+```bash
+cd $DIR/udunits-2.2.26
+# configure the package
+./configure \
+CC=ncc CXX=nc++ FC=nfort F90=nfort LD=nld AR=nar RANLIB=nranlib \
+CFLAGS=-O3 CPPFLAGS=-I$EXPAT_DIR/include LDFLAGS=-L$EXPAT_DIR/lib \
+--host=ve-nec-linux-gnu --prefix=$PREFIX
+
+# build
+make
+
+# test
+qlogin -q veinteractive -l elapstim_req=1800
+cd $PBS_O_WORKDIR
+make check
+exit
+
+# install
+make install
+```