trying to emerge install acpi_call-dkms, with the latest linux-libre-headers installed, produces the following error:

(2/2) Install DKMS modules
==> dkms install --no-depmod acpi_call/1.2.2 -k 5.15.12-gnu-1
Error! Bad return status for module build on kernel: 5.15.12-gnu-1 (x86_64)
Consult /var/lib/dkms/acpi_call/1.2.2/build/make.log for more information.

the contents of the log file are:

DKMS make.log for acpi_call-1.2.2 for kernel 5.15.12-gnu-1 (x86_64)
Sat Feb 19 12:23:28 PM CET 2022
make -C /lib/modules/5.15.12-gnu-1/build M=/var/lib/dkms/acpi_call/1.2.2/build modules
make[1]: Entering directory '/usr/lib/modules/5.15.12-gnu-1/build'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: gcc (GCC) 11.1.0
  You are using:           gcc (GCC) 11.2.0
  CC [M]  /var/lib/dkms/acpi_call/1.2.2/build/acpi_call.o
cc1: error: incompatible gcc/plugin versions
cc1: error: failed to initialize plugin ./scripts/gcc-plugins/structleak_plugin.so                                                                  
make[2]: *** [scripts/Makefile.build:277: /var/lib/dkms/acpi_call/1.2.2/build/acpi_call.o] Error 1                                                  
make[1]: *** [Makefile:1868: /var/lib/dkms/acpi_call/1.2.2/build] Error 2
make[1]: Leaving directory '/usr/lib/modules/5.15.12-gnu-1/build'
make: *** [Makefile:8: default] Error 2

the file scripts/gcc-plugins/structleak_plugin.so is owned by linux-libre-headers, and I think it needs to be rebuilt.

$ pacman -Qo /usr/src/linux-libre/scripts/gcc-plugins/structleak_plugin.so 
/usr/lib/modules/5.15.12-gnu-1/build/scripts/gcc-plugins/structleak_plugin.so is owned by linux-libre-headers 5.15.12-1