Amazon Linux 2 Builds No Longer Use System OpenSSL

[calumgilchristfirstup]

On v20250811 ruby-build uses the system OpenSSL, but on v20250829 openssl is built from source on amazonlinux 2.

This broke my builds because I had CONFIGURE_OPTS instead of RUBY_CONFIGURE_OPTS, and didn't have some of the perl dependencies required.

Fixing those the builds pass but it looks like the new pkg-config check from fd0f332 is causing the system openssl not to be detected.

Reproduction:

$ docker run --rm -it amazonlinux:2
$ yum install -y autoconf gcc patch bzip2 openssl-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel tar \
  make pkgconfig
$ git clone https://github.com/rbenv/ruby-build.git ruby-build
$ cd ruby-build
$ ./bin/ruby-build -d ruby-3.2.2 ~/.rubies -v 
./bin/ruby-build: line 1155: 2k: value too great for base (error token is "2k")
# OpenSSL installed

Comparing the new pkg-config method and the old I think I see the issue:

bash-4.2# pkg-config --modversion openssl
1.0.2k

# system_openssl_version
bash-4.2# cc -xc -E - <<EOF 2>/dev/null | sed -n 's/"\{0,1\}OpenSSL \([0-9][0-9.]*\).*/\1/p'
> #include <openssl/opensslv.h>
> OPENSSL_VERSION_TEXT
> EOF
1.0.2

The extra k in the amazon package seems to trip up the version check. The k wasn't included before.

[mislav]

Fantastic sleuthing; thank you! Will work on a fix.