$NetBSD$

Fix paths to comply with pkgsrc.

--- bin/ruby-build.orig	2025-06-12 05:04:30.397305127 +0000
+++ bin/ruby-build
@@ -1370,7 +1370,7 @@ unset IPV6
 unset EARLY_EXIT
 unset APPEND_DEFINITION_TO_PREFIX
 
-RUBY_BUILD_INSTALL_PREFIX="$(abs_dirname "$0")/.."
+RUBY_BUILD_INSTALL_PREFIX="@PREFIX@"
 
 # shellcheck disable=SC2206
 IFS=: RUBY_BUILD_DEFINITIONS=($RUBY_BUILD_DEFINITIONS ${RUBY_BUILD_ROOT:-$RUBY_BUILD_INSTALL_PREFIX}/share/ruby-build)
