Error Installing ngsxFEM

Hi community, I have this error in the instalation:

[ 59%] Building CXX object comp/CMakeFiles/ngcomp.dir/pde.cpp.o
/home/hpc/Downloads/src/ngsxfem/external_dependencies/ngsolve/comp/pde.cpp:8:10: fatal error: tcl.h: Arquivo ou diretório inexistente
8 | #include <tcl.h>
| ^~~~~~~
compilation terminated.
make[5]: *** [comp/CMakeFiles/ngcomp.dir/build.make:518: comp/CMakeFiles/ngcomp.dir/pde.cpp.o] Erro 1
make[4]: *** [CMakeFiles/Makefile2:732: comp/CMakeFiles/ngcomp.dir/all] Erro 2
make[3]: *** [Makefile:141: all] Erro 2
make[2]: *** [CMakeFiles/ngsolve.dir/build.make:117: dependencies/Stamp/ngsolve/ngsolve-build] Erro 2
make[1]: *** [CMakeFiles/Makefile2:223: CMakeFiles/ngsolve.dir/all] Erro 2
make: *** [Makefile:152: all] Erro 2
CMake Error at CMakeLists.txt:107 (find_package):
Could not find a package configuration file provided by "NGSolve" with any
of the following names:

NGSolveConfig.cmake
ngsolve-config.cmake

Add the installation prefix of "NGSolve" to CMAKE_PREFIX_PATH or set
"NGSolve_DIR" to a directory containing one of the above files. If
"NGSolve" provides a separate development package or SDK, be sure it has
been installed.


-- Configuring incomplete, errors occurred!
See also "/home/hpc/Downloads/build-xfem/CMakeFiles/CMakeOutput.log".
hpc@hpc:~/Downloads/build-xfem$


This file #include <tcl.h>, appear in the /home/hpc/Downloads/src/ngsxfem/external_dependencies/ngsolve/solve/ngsolve.cpp

How can i solve this problem,

Best regards,

Hi,

ngsxfem tries to build ngsolve as part of the building process and hence requires the same dependencies, see docu.ngsolve.org/latest/install/installlinux.html#prerequisites . Make sure that the prerequisites are met before you try building again. Also, if there are problems, it may be a good idea to first install NGSolve independent of ngsxfem and lateron install ngsxfem separately.

Best,
Christoph