% shellcheck -s sh esy-build esy-configure configure-windows clone-flexdll

In esy-build line 9:
set -o pipefail
       ^------^ SC3040: In POSIX sh, set option pipefail is undefined.


In esy-configure line 21:
set -o pipefail
       ^------^ SC3040: In POSIX sh, set option pipefail is undefined.


In clone-flexdll line 12:
    cd flexdll
    ^--------^ SC2164: Use 'cd ... || exit' or 'cd ... || return' in case cd fails.

Did you mean:
    cd flexdll || exit


In clone-flexdll line 14:
    cd ..
    ^---^ SC2103: Use a ( subshell ) to avoid having to cd back.

For more information:
  https://www.shellcheck.net/wiki/SC2164 -- Use 'cd ... || exit' or 'cd ... |...
  https://www.shellcheck.net/wiki/SC3040 -- In POSIX sh, set option pipefail ...
  https://www.shellcheck.net/wiki/SC2103 -- Use a ( subshell ) to avoid havin...