How to use functions in xtcio.h from third-party program with gromacs 2021.1

User discussions
1

GROMACS version: 2021.1
GROMACS modification: No

I used gromacs 2019.2 and analyzed the trajectories by my own programs.
These programs call functions in xtcio.h to directly read xtc files.
In particular, I included GMXroot/include/gromacs/fileio/xtcio.h and linked the programs by -lgromacs.

Recently, I have tried to move to a newer version of gromacs,
and I realized that the xtcio.h file is there anymore.

Is there any way to use to the xtcio.h file and link my program with gromacs2021.1?

2

The file is there in my gmx 2021 tree.

3

I installed gromacs2021.2 again but I could not find the file under the installation directory,
but I found it in source tree.

Here is my installation script.

~/programs/cmake-3.21.0-rc2-linux-x86_64/bin/cmake ..  \
 -DGMX_BUILD_OWN_FFTW=ON -DGMX_DOUBLE=OFF  \
 -DCMAKE_INSTALL_PREFIX=~/programs/gromacs-2021.2/  \
 -DGMX_X11=ON  -DGMX_GPU=OFF -DREGRESSIONTEST_DOWNLOAD=ON\
 -DGMX_MPI=OFF
make -j 10
make install -j 10

I checked files by

ls -p ~/programs/gromacs-2021.2/include/gromacs/

then I find only four directories,

math/  mdrun/  restraint/  utility/

On the other hand, I can find the following files under the installation directory of gromacs2019.2 (~/programs/gromacs-2019.2/include/gromacs/):

analysisdata/   fileio/         mdtypes/   restraint/   trajectoryanalysis/
analysisdata.h  gmxana/         options/   selection/   trajectoryanalysis.h
commandline/    gpu_utils/      options.h  selection.h  utility/
commandline.h   linearalgebra/  pbcutil/   timing/      utility.h
compat/         math/           random/    topology/    version.h
fft/            mdlib/          random.h   trajectory/

And I used the fileio/xtcio.h there previously.

Anyway, I found it in the source file, gromacs-2021.2/src/gromacs/fileio/, probably as hess meant.
Also, I was able to dynamically link my programs to the gromacs so files.

I would appreciate if someone could tell me whether the elimination from the installation directory was on purpose. (I just might have overlooked some comment in release notes, though.)

Many thanks.