diff --git a/dvs-rpkg/configure b/dvs-rpkg/configure
index b0c3b2b1..cb57c50c 100755
--- a/dvs-rpkg/configure
+++ b/dvs-rpkg/configure
@@ -614,22 +614,18 @@ CDYLIB_EXT
 CDYLIB_PREFIX
 TAR_FORCE_LOCAL
 CARGO_STATICLIB_NAME
-PACKAGE_TARNAME_RS_UPPERCASE
-PACKAGE_TARNAME_RS
 CARGO_LIBDIR
 CARGO_BUILD_TARGET
 ENV_RUSTFLAGS
 CARGO_PROFILE
 CARGO_TARGET_DIR_CARGO
 CARGO_TARGET_DIR
-CARGO_CMD
 RUST_TOOLCHAIN
 ABS_RPKG_SRC_CARGO
 CYGPATH
 SED
 RUSTC
 CARGO
-ROOT_MINIEXTENDR_REPO
 ABS_RPKG_SRCDIR
 ABS_TOP_SRCDIR
 CARGO_FEATURES_FLAG
@@ -2019,8 +2015,6 @@ ABS_RPKG_SRCDIR="$abs_rpkg_src"
 RUST_SRC_DIR="$abs_rpkg_src/rust"
 
 root_miniextendr_repo="$(cd "$abs_rpkg_src/../.." && pwd)"
-ROOT_MINIEXTENDR_REPO="$root_miniextendr_repo"
-
 
 if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}cargo", so it can be a program name with args.
@@ -2350,9 +2344,6 @@ then :
 fi
 
 
-
-
-
 abs_rpkg_src_cargo="$abs_rpkg_src"
 case "$host_os" in
   *msys*|*cygwin*|*mingw*)
@@ -2385,7 +2376,6 @@ fi
 CARGO_CMD="$CARGO $RUST_TOOLCHAIN"
 
 
-
 : ${CARGO_TARGET_DIR="$abs_top_srcdir/rust-target"}
 
 
@@ -2466,22 +2456,13 @@ then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: CARGO_BUILD_TARGET    = $CARGO_BUILD_TARGET" >&5
 printf "%s\n" "$as_me: CARGO_BUILD_TARGET    = $CARGO_BUILD_TARGET" >&6;}
 fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: ROOT_MINIEXTENDR_REPO = $ROOT_MINIEXTENDR_REPO" >&5
-printf "%s\n" "$as_me: ROOT_MINIEXTENDR_REPO = $ROOT_MINIEXTENDR_REPO" >&6;}
 if test -n "$DVS_FEATURES"
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: DVS_FEATURES  = $DVS_FEATURES" >&5
 printf "%s\n" "$as_me: DVS_FEATURES  = $DVS_FEATURES" >&6;}
 fi
 
-pkg_rs="$(echo "$PACKAGE_NAME" | $SED 's/-/_/g; s/\./_/g')"
-PACKAGE_TARNAME_RS=$pkg_rs
-
-pkg_rs_upper=`printf '%s' "$pkg_rs" | tr 'a-z' 'A-Z'`
-PACKAGE_TARNAME_RS_UPPERCASE=$pkg_rs_upper
-
-
-CARGO_STATICLIB_NAME="$pkg_rs"
+CARGO_STATICLIB_NAME="$(echo "$PACKAGE_NAME" | $SED 's/-/_/g; s/\./_/g')"
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: CARGO_STATICLIB_NAME  = $CARGO_STATICLIB_NAME" >&5
 printf "%s\n" "$as_me: CARGO_STATICLIB_NAME  = $CARGO_STATICLIB_NAME" >&6;}
diff --git a/dvs-rpkg/configure.ac b/dvs-rpkg/configure.ac
index ce53d76d..580fe9ef 100644
--- a/dvs-rpkg/configure.ac
+++ b/dvs-rpkg/configure.ac
@@ -96,7 +96,6 @@ RUST_SRC_DIR="$abs_rpkg_src/rust"
 
 dnl Canonical path two levels above src (rpkg/src → miniextendr)
 root_miniextendr_repo="$(cd "$abs_rpkg_src/../.." && pwd)"
-AC_SUBST([ROOT_MINIEXTENDR_REPO], ["$root_miniextendr_repo"])
 
 dnl ---- tool discovery ----
 AC_PATH_TOOL([CARGO],[cargo],[no])
@@ -107,9 +106,7 @@ AS_IF([test "x$CARGO" = "xno"], [AC_MSG_ERROR([`cargo` not found])])
 AS_IF([test "x$RUSTC" = "xno"], [AC_MSG_ERROR([`rustc` not found])])
 AS_IF([test "x$SED" = "xno"], [AC_MSG_ERROR([`sed` not found])])
 AC_SUBST([CARGO])
-AC_SUBST([RUSTC])
-AC_SUBST([SED])
-AC_SUBST([CYGPATH])
+dnl RUSTC, SED, CYGPATH used only within configure.ac — no AC_SUBST needed
 
 dnl Use native paths for Cargo on Windows/MSYS to avoid path mangling.
 dnl MSYS2 paths like /d/a/foo become D:/d/a/foo when interpreted by Cargo,
@@ -147,7 +144,6 @@ AC_SUBST([RUST_TOOLCHAIN])
 
 dnl Convenience: cargo command that includes optional toolchain selector
 CARGO_CMD="$CARGO $RUST_TOOLCHAIN"
-AC_SUBST([CARGO_CMD])
 
 dnl ---- Cargo configuration ----
 dnl IMPORTANT: target directory MUST be outside src/ to avoid pkgbuild scanning
@@ -231,20 +227,13 @@ AS_IF([test -n "$RUST_TOOLCHAIN"],
       [AC_MSG_NOTICE([RUST_TOOLCHAIN        = $RUST_TOOLCHAIN])])
 AS_IF([test -n "$CARGO_BUILD_TARGET"],
       [AC_MSG_NOTICE([CARGO_BUILD_TARGET    = $CARGO_BUILD_TARGET])])
-AC_MSG_NOTICE([ROOT_MINIEXTENDR_REPO = $ROOT_MINIEXTENDR_REPO])
 AS_IF([test -n "$DVS_FEATURES"],
       [AC_MSG_NOTICE([DVS_FEATURES  = $DVS_FEATURES])])
 
 dnl ---- package name → Rust-safe variants ----
 dnl Use PACKAGE_NAME (case-preserving) not PACKAGE_TARNAME (lowercased)
 dnl so the entrypoint's R_init_*_miniextendr symbol matches the Rust module exactly.
-pkg_rs="$(echo "$PACKAGE_NAME" | $SED 's/-/_/g; s/\./_/g')"
-AC_SUBST([PACKAGE_TARNAME_RS], [$pkg_rs])
-pkg_rs_upper=`printf '%s' "$pkg_rs" | tr 'a-z' 'A-Z'`
-AC_SUBST([PACKAGE_TARNAME_RS_UPPERCASE], [$pkg_rs_upper])
-
-dnl Staticlib name matches the Rust crate name (= pkg_rs)
-CARGO_STATICLIB_NAME="$pkg_rs"
+CARGO_STATICLIB_NAME="$(echo "$PACKAGE_NAME" | $SED 's/-/_/g; s/\./_/g')"
 AC_SUBST([CARGO_STATICLIB_NAME])
 AC_MSG_NOTICE([CARGO_STATICLIB_NAME  = $CARGO_STATICLIB_NAME])