Current 'next' branch fails to compile grub

Hello *,

the current 'next' branch of IPFire 2.x fails to compile grub:

grub (2.02) [ 34 ][ FAIL ]

config.status: creating config-util.h
config.status: linking include/grub/x86_64 to include/grub/cpu
config.status: linking include/grub/x86_64/efi to include/grub/machine
config.status: executing depfiles commands
config.status: executing po-directories commands
config.status: creating po/POTFILES
config.status: creating po/Makefile
*******************************************************
GRUB2 will be compiled with following components:
Platform: x86_64-efi
With devmapper support: Yes
With memory debugging: No
With disk cache statistics: No
With boot time statistics: No
efiemu runtime: No (not available on efi)
grub-mkfont: Yes
grub-mount: No (need FUSE library)
starfield theme: No (No DejaVu found)
With libzfs support: No (need zfs library)
Build-time grub-mkfont: Yes
With unifont from ./unifont.pcf.gz
With liblzma from -llzma (support for XZ-compressed mips images)
*******************************************************
cd /usr/src/grub-2.02-efi && make -j5
make[1]: Entering directory '/usr/src/grub-2.02-efi'
python gentpl.py Makefile.util.def Makefile.utilgcry.def > Makefile.util.am.new || (rm -f Makefile.util.am.new; exit 1)
/bin/sh: python: command not found
make[1]: *** [Makefile:12159: Makefile.util.am] Error 1
make[1]: Leaving directory '/usr/src/grub-2.02-efi'
make: *** [grub:108: /usr/src/log/grub-2.02] Error 2

ERROR: Building grub [ FAIL ] Check /home/pmu/working/ipfire-2.x/log/_build.ipfire.log for errors if applicable [ FAIL ]

Anything I am doing wrong? Anybody else experiencing this error?

Footnote: Intention was to update Tor, iptables and libnetfilter_queue. Just in case anybody else is currently at these, too. iproute2 also needs a major update, but that will be a second step.

Thanks, and best regards, Peter Müller