Hi,
I solved most of the compilation issue with freecad.
Now my package version compiles but install phase fails with this error:
``` CMake Error at src/3rdParty/salomesmesh/cmake_install.cmake:41 (if): if given arguments: "EXISTS" "/tmp/guix-build-freecad-mine-0.18.5.drv-0/build/" "/gnu/store/injf0n8qja607qswa5cyxz1dpzqia21p-freecad-mine-0.18.5/lib\"/libSMDS.so\"" "AND" "NOT" "IS_SYMLINK" "/tmp/guix-build-freecad-mine-0.18.5.drv-0/build/" "/gnu/store/injf0n8qja607qswa5cyxz1dpzqia21p-freecad-mine-0.18.5/lib\"/libSMDS.so\"" Unknown arguments specified Call Stack (most recent call first): src/3rdParty/cmake_install.cmake:42 (include) src/cmake_install.cmake:43 (include) cmake_install.cmake:46 (include)
```
Did anyone see something like this before?
Right now I have no idea how to tackle this but I'll keep researching.
If anyone wants to be able to reach this point, the only changes I applied to the project are configure-flags suggested in this bug report with some extra more because the header files were not found in subdirectories. These are the configure flags I added (mostly copied from Nix package[^nix]):
```
(list
"-DBUILD_QT5=ON"
(string-append "-DCMAKE_INSTALL_LIBDIR=\"" (assoc-ref %outputs "out") "/lib\"")
(string-append "-DPYSIDE2UICBINARY="
(assoc-ref %build-inputs "python-pyside-2-tools")
"/bin/uic")
(string-append "-DPYSIDE2RCCBINARY="
(assoc-ref %build-inputs "python-pyside-2-tools")
"/bin/rcc")
"-DPYSIDE_LIBRARY=PySide2::pyside2"
(string-append "-DPYSIDE_INCLUDE_DIR="
(assoc-ref %build-inputs "python-pyside-2") "/include;"
(assoc-ref %build-inputs "python-pyside-2") "/include/PySide2;"
(assoc-ref %build-inputs "python-pyside-2") "/include/PySide2/QtCore;"
(assoc-ref %build-inputs "python-pyside-2") "/include/PySide2/QtWidgets;"
(assoc-ref %build-inputs "python-pyside-2") "/include/PySide2/QtGui;")
"-DSHIBOKEN_LIBRARY=Shiboken2::libshiboken"
(string-append "-DSHIBOKEN_INCLUDE_DIR="
(assoc-ref %build-inputs "python-shiboken-2")
"/include/shiboken2"))
```
I hope we can have something working soon!
Cheers,
Ekaitz