[Bug 297527] devel/llvm-devel: typo in DOCS_BUILD_DEPENDS for py-furo (double '@@') breaks dependency detection

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297527

            Bug ID: 297527
           Summary: devel/llvm-devel: typo in DOCS_BUILD_DEPENDS for
                    py-furo (double '@@') breaks dependency detection
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
             Flags: maintainer-feedback?([email protected])
          Assignee: [email protected]

Created attachment 273756
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=273756&action=edit
llvm-devel-furo-fix.diff that allowed the port to build with testport

DOCS_BUILD_DEPENDS in devel/llvm-devel's Makefile has a typo in the
py-furo dependency line: a doubled '@@' before ${PY_FLAVOR} instead
of a single '@'. This breaks the origin@flavor parsing, causing the
ports framework to misidentify the dependency and check for it as a
literal executable (via `which`) instead of a package in the pkg
database. Since py-furo is a Sphinx theme with no CLI binary, this
check always fails, even when py312-furo is correctly installed.

Affected file: devel/llvm-devel/Makefile, line 127

Current (broken):
    ${PYTHON_PKGNAMEPREFIX}furo:textproc/py-furo@@${PY_FLAVOR} \

Fixed:
    ${PYTHON_PKGNAMEPREFIX}furo>0:textproc/py-furo@${PY_FLAVOR} \

(Note the other DOCS_BUILD_DEPENDS entries on adjacent lines all
correctly use a single '@' before ${PY_FLAVOR} and include a version
operator, e.g. myst-parser>0, recommonmark>=0.0.20180530,
sphinx-markdown-tables>=0 — furo was the only outlier missing both.)

Steps to reproduce:
1. pkg install py312-furo (or build textproc/py-furo from ports)
2. cd /usr/ports/devel/llvm-devel && make build-depends
   (or via poudriere: poudriere testport -j <jail> -p <tree> -o
devel/llvm-devel)
3. Observe:
   ===> llvm-devel-24.0.d20260813 depends on executable: py312-furo - not found
   *** Error code 1
   even though `pkg info | grep furo` confirms py312-furo is installed.

Applying the attached one-line patch resolves the issue and the port
builds successfully.

Environment: FreeBSD [FreeBSD alto.my.domain 15.1-STABLE FreeBSD 15.1-STABLE
stable/15-n284649-23216f6309c6 GENERIC amd64
], poudriere-based
build, devel/llvm-devel snapshot 24.0.d20260813

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