Hi Paul, I found that at the commit immediately preceding 2ca0d57, building automake-1.16.1 can successfully run the tests t/autohdr4.sh and t/autohdr-subdir-pr12495.sh. I cannot build commit 2ca0d57. It fails with: autom4te_perllibdir='.'/lib AUTOM4TE_CFG='lib/autom4te.cfg' ./bin/autom4te -B '.'/lib -B '.'/lib --language M4sh --cache '' \ --melt ./bin/autoconf.as -o bin/autoconf.in Undefined subroutine &main::open_quote called at ./bin/autom4te line 261. Makefile:2017: recipe for target 'bin/autoconf.in' failed make[1]: *** [bin/autoconf.in] Error 1 make[1]: Leaving directory '/tmp/autoconf' Makefile:859: recipe for target 'all' failed make: *** [all] Error 2 I can build the commit immediately following 2ca0d57, but building automake-1.16.1 reports that the tests in question fail. My question is: should the problem be fixed in autoconf by fixing whatever goes wrong with commit 2ca0d57? Or, should the problem be fixed in automake? Thank you. -- Best regards, Tadeus