diff --git a/steps-guix/guix-hash-compat-1.5.0/pass1.sh b/steps-guix/guix-hash-compat-1.5.0/pass1.sh
index 891ff45b..334eb3da 100644
--- a/steps-guix/guix-hash-compat-1.5.0/pass1.sh
+++ b/steps-guix/guix-hash-compat-1.5.0/pass1.sh
@@ -15,24 +15,55 @@ src_compile() {
 src_install() {
     local compat_src
     local compat_bin
+    local compat_config
+    local src_system
     compat_src="${DESTDIR}/usr/libexec/guix-hash-compat/guix-1.5.0"
     compat_bin="${DESTDIR}/usr/bin/guix-hash-compat"
+    compat_config="${compat_src}/guix/config.scm"
+    src_system="$(uname -m)-linux"
+    case "${src_system}" in
+        x86_64-linux|i686-linux)
+            ;;
+        *)
+            src_system="x86_64-linux"
+            ;;
+    esac
 
     mkdir -p "${compat_src}"
     cp -a . "${compat_src}/"
     mkdir -p "$(dirname "${compat_bin}")"
+    sed \
+        -e 's|@PACKAGE_NAME@|guix|g' \
+        -e 's|@PACKAGE_VERSION@|1.5.0|g' \
+        -e 's|@PACKAGE_BUGREPORT@|bug-guix@gnu.org|g' \
+        -e 's|@PACKAGE_URL@|https://guix.gnu.org|g' \
+        -e 's|@GUIX_CHANNEL_URL@|#f|g' \
+        -e 's|@GUIX_CHANNEL_COMMIT@|#f|g' \
+        -e 's|@GUIX_CHANNEL_INTRODUCTION@|#f|g' \
+        -e 's|@storedir@|/gnu/store|g' \
+        -e 's|@guix_localstatedir@|/var|g' \
+        -e 's|@guix_sysconfdir@|/etc|g' \
+        -e "s|@guix_system@|${src_system}|g" \
+        -e 's|@GIT@|/usr/bin/git|g' \
+        -e 's|@GZIP@|/usr/bin/gzip|g' \
+        -e 's|@BZIP2@|/usr/bin/bzip2|g' \
+        -e 's|@XZ@|/usr/bin/xz|g' \
+        "${compat_src}/guix/config.scm.in" > "${compat_config}"
 
     cat > "${compat_bin}" <<'EOS'
 #!/bin/sh
 set -e
 
 src_dir="/usr/libexec/guix-hash-compat/guix-1.5.0"
-if [ -d /tmp/guix-1.5.0 ]; then
-    src_dir="/tmp/guix-1.5.0"
-fi
 
-cd "${src_dir}"
-exec ./pre-inst-env guix hash "$@"
+export GUIX_UNINSTALLED=1
+export GUILE_LOAD_PATH="${src_dir}${GUILE_LOAD_PATH:+:}${GUILE_LOAD_PATH}"
+export GUILE_LOAD_COMPILED_PATH="${src_dir}${GUILE_LOAD_COMPILED_PATH:+:}${GUILE_LOAD_COMPILED_PATH}"
+exec /usr/bin/guile --no-auto-compile \
+    -L "${src_dir}" \
+    -C "${src_dir}" \
+    -c '(use-modules (guix scripts hash)) (apply guix-hash (cdr (command-line)))' \
+    guix-hash-compat "$@"
 EOS
     chmod 0755 "${compat_bin}"
 }