Installing FreeCad from Source Error

[glicka]

I've been trying all day to install FreeCAD on a linux ubuntu terminal for Windows. I've installed all the dependencies and CMake finishes without error, but I can't compile it with make. I get the error:

```
/home/glicka/FreeCAD/src/Mod/Part/App/PartFeatures.cpp:28:11: fatal error: BRepAdaptor_HCurve.hxx: No such file or directory 28 | # include <BRepAdaptor_HCurve.hxx> | ^~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. make[2]: *** [src/Mod/Part/App/CMakeFiles/Part.dir/build.make src/Mod/Part/App/CMakeFiles/Part.dir/PartFeatures.cpp.o] Error 1 make[1]: *** [CMakeFiles/Makefile2 src/Mod/Part/App/CMakeFiles/Part.dir/all] Error 2 make[1]: *** Waiting for unfinished jobs....
```

I've also tried to install it using conda-forge by:
```
conda install -c conda-forge freecad
```
but it won't work that way either.

[kkremitzki]

fatal error: BRepAdaptor_HCurve.hxx: No such file or directory

The error is caused by this file being missing. It is part of the libocct-modeling-data-dev package. Can you check to make sure you have that installed?

[glicka]

It is installed. When I run `sudo apt install libocct-modeling-data-dev`

I get
```
Reading package lists... Done Building dependency tree Reading state information... Done libocct-modeling-data-dev is already the newest version (7.3.3+dfsg1-1build1). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
```

[wmayer]

The recently released OCCT 7.6 has removed a lot of classes and header files (such as BRepAdaptor_HCurve.hxx). Is it possible that your OCCT version was based on the development branch of 7.6?