configure.ac contains Bash-specific syntax

[0mp]

I'm trying to port Nix to FreeBSD and I've come across a problem when running ./configure.

It turns out that the configure file that is generated from configure.ac has Bash-specific syntax although the shebang line specifies /bin/sh.

The offending line is here:

nix/configure.ac

Line 217 in 3d974d3

declare -a aws_version_tokens=($(printf '#include <aws/core/VersionConfig.h>\nAWS_SDK_VERSION_STRING' | $CPP $CPPFLAGS - | grep -v '^#.*' | sed 's/"//g' | tr '.' ' '))

Is this a bug or the shebang line should refer to Bash (if so then how can I tell autoconf the path to my Bash binary)?

[0mp]

I've found a way around it.

If you'd like to help with porting Nix to FreeBSD then follow this issue first: https://reviews.freebsd.org/D17766