ocrmypdf: fix dependencies

Closes: https://trac.macports.org/ticket/71816

textproc/ocrmypdf/Portfile

@@ -27,28 +27,23 @@ supported_archs     noarch
 platforms           {darwin any}
 license             MPL-2
 
-variant python310 conflicts python311 python312 python313 description "Use Python 3.10" {
-    python.default_version 310
+set pyvers {310 311 312 313}
+foreach pyver $pyvers {
+    set pyconflicts [lmap v [ldelete $pyvers $pyver] {string cat python${v}}]
+    variant python${pyver} conflicts {*}$pyconflicts description "Use Python 3.[string range $pyver 1 end]" {}
+    if {[variant_isset python${pyver}]} {
+        python.default_version  ${pyver}
+        set any_py_variant_set 1
+    }
 }
-
-variant python311 conflicts python310 python312 python313 description "Use Python 3.11" {
-    python.default_version 311
-}
-
-variant python312 conflicts python310 python311 python313 description "Use Python 3.12" {
-    python.default_version 312
-}
-
-variant python313 conflicts python310 python311 python312 description "Use Python 3.13" {
+if {![info exists any_py_variant_set]} {
+    default_variants +python313
     python.default_version 313
 }
 
-if {![variant_isset python310] && ![variant_isset python311] && ![variant_isset python312]} {
-    default_variants +python313
-}
+python.pep517_backend   hatch
 
 depends_build-append \
-                    port:py${python.version}-hatchling \
                     port:py${python.version}-hatch-vcs
 
 depends_lib-append  port:img2pdf \