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I have tried to compile vaspsol with its guide for vasp.6.1.0，but failed
the error codes:
solvation.o: In function `pot_k_mp_vcorrection_':
solvation.f90:(.text+0xf41c): undefined reference to `m_sum_s_'
solvation.f90:(.text+0xf561): undefined reference to `m_sum_s_'
makefile:145: recipe for target 'vasp' failed
make[2]: *** [vasp] Error 1
make[2]: Leaving directory '/home/xxx/vasp/vasp.6.1.0/build/std'
cp: cannot stat 'vasp': No such file or directory
makefile:142: recipe for target 'all' failed
make[1]: *** [all] Error 1
make[1]: Leaving directory '/home/xxx/vasp/vasp.6.1.0/build/std'
makefile:6: recipe for target 'std' failed
make: *** [std] Error 2

How to deal with this problem.

We (the VASP Team) don't provide support for vaspsol.
Some other users of the forum might be able to help you.
Alternatively, you might ask this question in the issues in the vaspsol github page:
https://github.com/henniggroup/VASPsol/issues

well, you could modified src/mpi.F file to solve this question.
First, open src/mpi.F by "vim src/mpi.F" and found the "SUBROUTINE M_sum_s" at about line 1895, and then remove all the "!!" of this subfunction. Finally, compiling VASP and it will work fine.
GOOD LUCK!

Thanks for the above answer, i have solved this problem. https://github.com/henniggroup/VASPsol/issues/43