Hi: is Automake 1.15.1 a hard requirement to build GCC 'master' ? The host build environment is kernel: 5.7.4-arch1-1 gcc: 10.1.0 glibc: 2.31.-5 64-bit env no multi-lib The versions of 'auto' tools are autoconf 2.69-7 automake 1.16.2-3 autogen 5.18.16-1 Please see the 'truncated' error log below. make[3]: Entering directory '/home/strikr/work/build/gcc/lto-plugin' cd ../../../../src/gcc/lto-plugin && /bin/sh /home/strikr/src/gcc/missing automake-1.15 --foreign configure.ac:4: error: version mismatch. This is Automake 1.16.2, configure.ac:4: but the definition used by this AM_INIT_AUTOMAKE configure.ac:4: comes from Automake 1.15.1. You should recreate configure.ac:4: aclocal.m4 with aclocal and run automake again. WARNING: 'automake-1.15' is probably too old. You should only need it if you modified 'Makefile.am' or 'configure.ac' or m4 files included by 'configure.ac'. The 'automake' program is part of the GNU Automake package: <http://www.gnu.org/software/automake> It also requires GNU Autoconf, GNU m4 and Perl in order to run: <http://www.gnu.org/software/autoconf> <http://www.gnu.org/software/m4/> <http://www.perl.org/> make[3]: *** [Makefile:383: ../../../../src/gcc/lto-plugin/Makefile.in] Error 1 make[3]: Leaving directory '/home/strikr/work/build/gcc/lto-plugin' make[2]: *** [Makefile:14659: all-stage1-lto-plugin] Error 2 make[2]: Leaving directory '/home/strikr/work/build/gcc' make[1]: *** [Makefile:23439: stage1-bubble] Error 2 make[1]: Leaving directory '/home/strikr/work/build/gcc' make: *** [Makefile:999: all] Error 2 Any pointers ? warm regards Saifi.