Oracle Linux 9 slim container building Ruby 3.3.6 failing on phych

[Alistair-Hardy]

I'm building inside of an Oracle Linux 9 Slim container and I'm getting the below.

*** Following extensions are not compiled:
psych:
        Could not be configured. It will not be installed.
        Check ext/psych/mkmf.log for more details.
*** Fix the problems, then remove these directories and try again if you want.
make[1]: *** [exts.mk:2422: note] Error 1
make[1]: Leaving directory '/tmp/ruby-build.20250116133654.453.ELFWuj/ruby-3.3.6'
make: *** [uncommon.mk:398: build-ext] Error 2
external command failed with status 2

BUILD FAILED (Oracle Linux Server 9.5 on x86_64 using ruby-build 20241225.2)

You can inspect the build directory at /tmp/ruby-build.20250116133654.453.ELFWuj

And upon checking the referenced log file I'm getting the below

pkg_config: checking for pkg-config for yaml-0.1... -------------------- not found

LD_LIBRARY_PATH=.:../.. pkg-config --exists yaml-0.1
package configuration for yaml-0.1 is not found
--------------------

find_header: checking for yaml.h... -------------------- no

LD_LIBRARY_PATH=.:../.. "gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/psych    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wdiv-by-zero -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wold-style-definition -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable -Wmisleading-indentation -Wundef  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed     -Wl,-rpath,/root/.rubies/ruby-3.3.6/lib -L/root/.rubies/ruby-3.3.6/lib -lruby-static -lz -lrt -lrt -ldl -lcrypt -lm -lpthread   -lm -lpthread  -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return !!argv[argc];
6: }
/* end */

LD_LIBRARY_PATH=.:../.. "gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/psych    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wdiv-by-zero -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wold-style-definition -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable -Wmisleading-indentation -Wundef  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: yaml.h: No such file or directory
    3 | #include <yaml.h>
      |          ^~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <yaml.h>
/* end */

--------------------

I'm following the instructions as best I can with my build script looking like this.

#!/bin/bash

printf "\n---Updating software in container---\n\n"
mv /tmp/uek-ol9.repo /etc/yum.repos.d/

microdnf install -y dnf oracle-epel-release-el9
dnf -y install 'dnf-command(config-manager)'
dnf config-manager --enable ol9_codeready_builder
dnf upgrade -y

printf "\n---Installing ruby build---\n\n"
tar -xzf /tmp/ruby-build-*.tar.gz
PREFIX=/usr/local ./ruby-build-*/install.sh

printf "\n---Installing Build Dependancies for Ruby---\n\n"
dnf  install -y autoconf gcc patch bzip2 openssl-devel libffi-devel readline zlib-devel gdbm ncurses-devel tar perl-FindBin libtool 

printf "\n---Building Ruby from source---\n\n"
/usr/local/bin/ruby-build -v $RUBY_VERSION ~/.rubies/ruby-$RUBY_VERSION 

Building software from source is not something I'm familiar with, so I suspect I'm missing something obvious.
I've tried following this other discussion as well as adding the libyaml from this stack overflow thread

What am I missing here?

[mislav]

Hi, "psych" is Ruby's confusingly-named YAML extension, and it requires libyaml.

Try installing libyaml-devel: https://github.com/rbenv/ruby-build/wiki#fedora

[Alistair-Hardy]

Thank you. I used the install list for RHEL as it's the closest to Oracle Linux. It's probably worth updating the instructions to support Oracle Linux.

[mislav]

That's a good point; now I see that RHEL instructions also don't mention libyaml-devel although it's technically required. I don't know much about these operating systems; but if you determine that libyaml-devel is available from default repositories on RHEL (I don't know how to look this up online), feel free to add it to those instructions, and you're welcome to add a note for Oracle Linux.