source $stdenv/setup

tar xvfz $src
cd namd-*

tar xvf charm-6.7.0.tar
cd charm-6.7.0

find . -type f |xargs sed -i 's/\/bin\/cp/cp/g'
find . -type f |xargs sed -i 's/\/bin\/rm/rm/g'
find . -type f |xargs sed -i 's/\/lib\/cpp/cpp/g'

./build charm++ multicore-linux64 --no-build-shared --with-production
cd ..

tar xvfz fftw-linux-x86_64.tar.gz
mv linux-x86_64 fftw
tar xvfz tcl8.5.9-linux-x86_64.tar.gz
mv tcl8.5.9-linux-x86_64 tcl
tar xvfz tcl8.5.9-linux-x86_64-threaded.tar.gz
mv tcl8.5.9-linux-x86_64-threaded tcl-threaded

tcsh -f ./config  Linux-x86_64-g++   --charm-arch multicore-linux64
cd Linux-x86_64-g++
make
rm -rf obj
rm -rf src
rm -rf inc
rm Make*
rm -rf plugins
cp -r ../plugins .
rm sb
cp -r ../psfgen ./sb
mkdir -p $out/lib/namd
cp -r * $out/lib/namd
cd ..

mkdir -p $out/bin
ln -s $out/lib/namd2 $out/bin/namd2