OCCT 7.8 - Static Build Failure

Hi, I'm trying to build OCCT 7.8.0 statically (via spack) and am running into errors. Here is some system information:

linux-centos7-zen2
gcc/9.3.0
cmake/3.23.1

I edited the spack package configuration for opencascade (spack/var/spack/repos/builtin/packages/opencascade/package.py) by adding this:

args.append("-DBUILD_LIBRARY_TYPE=STATIC")
args.append(self.define("BUILD_MODULE_DETools", False))

Finally, I build the package using this command:

>> spack install -j 32 opencascade@7.8.0 % gcc@9.3.0

Before adding the BUILD_MODULE_DETools flag it gave this error:

6718 ../../lin64/gcc/lib/libTKExpress.a(Express.cxx.o): In function `Express::WriteFileStamp(std::ostream&)':
>> 6719 Express.cxx:(.text+0x9d): undefined reference to `OSD_Process::OSD_Process()'
>> 6720 Express.cxx:(.text+0xa5): undefined reference to `OSD_Process::SystemDate()'

Now, it gives this error:

../../lin64/gcc/lib/libTKDESTEP.a(STEPControl_ActorRead.cxx.o): In function `STEPControl_ActorRead::STEPControl_ActorRead(opencascade::handle<Interface_InterfaceModel> const&)':
STEPControl_ActorRead.cxx:(.text+0x58d): undefined reference to `Transfer_ActorOfTransientProcess::Transfer_ActorOfTransientProcess()'
../../lin64/gcc/lib/libTKDESTEP.a(STEPControl_ActorRead.cxx.o): In function `opencascade::type_instance<Transfer_ActorOfTransientProcess>::get()':

I'm out of ideas.

Thank you,
Travis