Hi,

I tried

guix build -K linphone-desktop

then waited until it told me the build directory (which was
/tmp/guix-build-linux-libre-5.5.10.drv-0), then

$ which strace
<remember that name>
$ cd /tmp/guix-build-linux-libre-5.5.10.drv-0
$ source environment-variables
$ cd source
$ .....strace -f cmake . 2>&1 |grep -i bctoolbox |grep -i cmake
It says, among other things, that it can't open
/gnu/store/m92m6bg0xcl28djxg8h97sszf3gdl42r-bctoolbox-4.3.1/share/bctoolbox/cmake/BcToolboxConfig.cmake
.

So I checked that directory and it indeed does not have that file.

But it does have
/gnu/store/m92m6bg0xcl28djxg8h97sszf3gdl42r-bctoolbox-4.3.1/share/bctoolbox/cmake/bctoolboxConfig.cmake
-- note the different case of the name.

So I'd say either linphone-desktop or bctoolbox has the case wrong in some cmake file.

linphone-desktop has the following line:

./CMakeLists.txt:  include("${EP_bctoolbox_CONFIG_DIR}/BcToolboxConfig.cmake")

... and that line is not going to work as-is.