Update the documentation

Makefile

@@ -61,6 +61,7 @@ export
 # Run a single step from ./steps
 define step
 	set -e
+	${LOCAL}/help/check-make.sh
 	start=$$(date +%s%N)
 	echo -e "\n\n\n+++ $(1) +++\n"
 	source "$(LOCAL)/help/gnu-utils.sh"
@@ -102,10 +103,6 @@ clean:
 # Show some details about the environment we are running it
 # (this is mostly for debugging in Docker)
 env:
-	if [[ "$(MAKE_VERSION)" =~ ^[1-3] ]]; then
-	    echo "Make must be 4+: $(MAKE_VERSION)"
-	    exit 1
-	fi
 	$(call step,env)
 
 # Get the list of repos from GitHub and then create directories

help/check-make.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# The MIT License (MIT)
+#
+# Copyright (c) 2021-2024 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+set -e
+set -o pipefail
+
+make_version=$(make --version | head -n1 | cut -d' ' -f3)
+make_version_int=$(echo "${make_version}" | cut -d'.' -f1)
+
+if [ "${make_version_int}" -lt 4 ]; then
+    echo "Make version must be 4 or higher. Current: ${make_version}"
+    if "${LOCAL}/help/is-macos.sh" ; then
+        echo "Try to update it with \"brew install make\""
+        if [ "$(uname -m)" = "arm64" ]; then
+            echo "Make sure you have \"/opt/homebrew/opt/make/libexec/gnubin\" in your PATH"
+        else
+            echo "Make sure you have \"/usr/local/opt/make/libexec/gnubin\" in your PATH"
+        fi
+    else
+        echo "Try to update it with \"sudo apt install make\""
+    fi
+    exit 1
+fi

steps/env.sh

@@ -35,7 +35,7 @@ bash_version=${BASH_VERSINFO:-0}
 if [ "${bash_version}" -lt 5 ]; then
     "${SHELL}" --version
     ps -p $$
-    echo "${SHELL} version is older than five: ${bash_version}"
+    echo "${SHELL} version must be 5 or higher. Current ${SHELL} version: ${bash_version}"
     exit 1
 fi