[ruby-core:116180] [Ruby master Bug#20179] `--with-ruby-version` configure option is not correctly applied to `rubyhdrdir`

Issue #20179 has been reported by vo.x (Vit Ondruch).

----------------------------------------
Bug #20179: `--with-ruby-version` configure option is not correctly applied to `rubyhdrdir`
https://bugs.ruby-lang.org/issues/20179

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [x86_64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
I am trying to configure ruby using `--with-ruby-version=ruby3.3`. Here is the configure output:

~~~
$ /builddir/build/BUILD/ruby-3.3.0/configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --runstatedir=/run --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-compress-debug-sections=no --disable-rpath --enable-mkmf-verbose --enable-shared --with-ruby-version=ruby3.3 --enable-yjit

... snip ...

---
Configuration summary for ruby version 3.3.0

   * Installation prefix: /usr
   * exec prefix:         /usr
   * arch:                x86_64-linux
   * site arch:           ${arch}
   * RUBY_BASE_NAME:      ruby
   * enable shared:       yes
   * ruby lib prefix:     ${libdir}/${RUBY_BASE_NAME}
   * site libraries path: ${rubylibprefix}/${sitearch}
   * vendor path:         ${rubylibprefix}/vendor_ruby
   * target OS:           linux
   * compiler:            gcc
   * with thread:         pthread
   * with coroutine:      amd64
   * enable shared libs:  yes
   * dynamic library ext: so
   * CFLAGS:              ${optflags} ${debugflags} ${warnflags}
   * LDFLAGS:             -L. -Wl,-z,relro -Wl,--as-needed  \
                          -Wl,-z,pack-relative-relocs -Wl,-z,now \
                          -specs=/usr/lib/rpm/redhat/redhat-hardened-ld \
                          -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  \
                          -Wl,--build-id=sha1 -fstack-protector-strong \
                          -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed
   * DLDFLAGS:            -Wl,-z,relro -Wl,--as-needed  \
                          -Wl,-z,pack-relative-relocs -Wl,-z,now \
                          -specs=/usr/lib/rpm/redhat/redhat-hardened-ld \
                          -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  \
                          -Wl,--build-id=sha1  
   * optflags:            -O3 -fno-fast-math
   * debugflags:          -ggdb3
   * warnflags:           -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
   * strip command:       strip -S -x
   * install doc:         rdoc
   * YJIT support:        yes
   * RJIT support:        yes
   * man page type:       doc

---
~~~

However, the option is not applied consistently, especially the `rubyhdrdir` stands out:

~~~
$ find . -name \*ruby3.3\*
./usr/lib64/ruby/ruby3.3
./usr/lib64/ruby/site_ruby/ruby3.3
./usr/lib64/ruby/vendor_ruby/ruby3.3
./usr/lib64/ruby/gems/ruby3.3
./usr/lib64/ruby/gems/ruby3.3/extensions/x86_64-linux/ruby3.3
./usr/include/ruby-ruby3.3
./usr/share/ri/ruby3.3
~~~

The correct path should be IMHO `./usr/include/ruby3.3`. I can likely workaround it by `--with-rubyhdrdir`, but I think this should behave consistently.



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