Can't copy to 'build-aux/config.guess' in autoconf.sh: Permission denied #27873
Description
#26422 broke the autogen.sh part of my development builds on NixOS - found #26422 by bisecting. The error is:
$ ./autogen.sh
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, 'build-aux'.
libtoolize: copying file 'build-aux/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'build-aux/m4'.
libtoolize: copying file 'build-aux/m4/libtool.m4'
libtoolize: copying file 'build-aux/m4/ltoptions.m4'
libtoolize: copying file 'build-aux/m4/ltsugar.m4'
libtoolize: copying file 'build-aux/m4/ltversion.m4'
libtoolize: copying file 'build-aux/m4/lt~obsolete.m4'
configure.ac:37: installing 'build-aux/compile'
configure.ac:27: installing 'build-aux/missing'
Makefile.am: installing 'build-aux/depcomp'
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, 'build-aux'.
libtoolize: copying file 'build-aux/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'build-aux/m4'.
libtoolize: copying file 'build-aux/m4/libtool.m4'
libtoolize: copying file 'build-aux/m4/ltoptions.m4'
libtoolize: copying file 'build-aux/m4/ltsugar.m4'
libtoolize: copying file 'build-aux/m4/ltversion.m4'
libtoolize: copying file 'build-aux/m4/lt~obsolete.m4'
configure.ac:122: installing 'build-aux/compile'
configure.ac:58: installing 'build-aux/missing'
src/Makefile.am: installing 'build-aux/depcomp'
cp: cannot create regular file 'build-aux/config.guess': Permission denied
Originally posted by @0xB10C in #26422 (comment)