diff --git a/readme.md b/readme.md
index c1550fc..5c32038 100644
--- a/readme.md
+++ b/readme.md
@@ -125,6 +125,7 @@ Handle project workflows in a unified way:
 | Variable          | Description              | Default                         |
 |:------------------|:-------------------------|:--------------------------------|
 | SPCD_CA_n         | Numbered CA certificates |                                 |
+| SPCD_CMD_SUM      | Command to check sums    | sha512sum                       |
 | SPCD_DNS_n        | Numbered name servers    | 9.9.9.9                         |
 | SPCD_GIT_RWX      | RWX Git repository       | rwx                             |
 | SPCD_GIT_SHUNIT   | ShUnit Git repository    | shunit2                         |
diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index 4e3b7a2..70a3673 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -4,8 +4,6 @@
 # │ _ │
 # ╰───╯
 
-_SPCD_CMD_SUM="sha512sum"
-
 _spcd_fill() {
     local index="${1}"
     while [ "${index}" -gt 0 ]; do
@@ -394,6 +392,7 @@ SPCD_PM_ZYPPER="zypper"
 spcd_step__environment_defaults_print() {
     set -- \
         \
+        "CMD_SUM" \
         \
         "GIT_RWX" \
         "GIT_SPCD" \
@@ -426,6 +425,7 @@ spcd_step__environment_defaults_print() {
 
 spcd_step__environment_defaults_set() {
     spcd_step "$(spcd_txt_get "set")"
+    [ -n "${SPCD_CMD_SUM}" ] || SPCD_CMD_SUM="sha512sum"
 
     [ -n "${SPCD_DNS_1}" ] || SPCD_DNS_1="9.9.9.9"
 
@@ -1268,13 +1268,13 @@ spcd_step__python_modules() {
     spcd_step "Check"
     script="${path}/bootstrap.sh"
     ls -l "${script}"
-    check="${script}.${_SPCD_CMD_SUM}"
-    "${_SPCD_CMD_SUM}" "${script}" >"${check}"
+    check="${script}.${SPCD_CMD_SUM}"
+    "${SPCD_CMD_SUM}" "${script}" >"${check}"
     printf "%s" "${SPCD}" >"${script}"
     ls -l "${script}"
     dos2unix "${script}"
     ls -l "${script}"
-    "${_SPCD_CMD_SUM}" -c "${check}" || spcd_error_ci "SPCD"
+    "${SPCD_CMD_SUM}" -c "${check}" || spcd_error_ci "SPCD"
     spcd_step "Root"
     spcd_python_pip "${SPCD_GIT_RWX}"
     spcd_step "List"
@@ -1312,7 +1312,7 @@ spcd_step__install_packages() {
                 "|^#baseurl|baseurl|"
         done
         file="/etc/yum.repos.d/epel-cisco-openh264.repo"
-        if [ -f "${file}" ]; then
+        if [ -f "${spcd_spr__file}" ]; then
             spcd_os_sed "${file}" \
                 "|^enabled=1|enabled=0|"
         fi