changes

configure.ac

@@ -4,6 +4,10 @@ AC_CHECK_PROGS([MAKE], [make], [no])
 AS_IF([test "$MAKE" == "no"], 
       [AC_MSG_NOTICE([without GNU Make, you have to inspect 'Makefile' and deduce build targets yourself.])])
 
+AC_CHECK_PROGS([M4], [m4], [no])
+AS_IF([test "$M4" == "no"], 
+      [AC_MSG_NOTICE([without GNU M4, you will be unable to generate bitbucket-pipelines.yml.])])
+
 AC_CHECK_PROGS([GIT], [git], [no])
 AS_IF([test "$GIT" == "no"], 
       [AC_MSG_ERROR([install Git, before continuing.])])
@@ -12,7 +16,19 @@ AC_CHECK_PROGS([PYTHON3], [python3], [no])
 AS_IF([test "$PYTHON3" == "no"],
       [AC_MSG_ERROR([install Python 3, before continuing.])])
 
-AC_CHECK_PROGS([PYTHON3], [pipenv], [no])
+AC_CHECK_PROGS([PIPENV], [pipenv], [no])
+AS_IF([test "$PIPENV" == "no"],
+      [AC_MSG_ERROR([install pipenv (pip) package, before continuing.
+
+Alternatively bootstrap a venv:
+
+    python3 -m venv --system-site-packages .venv
+    .venv/bin/python3 -m pip install pipenv
+
+Then execute this script through pipenv:
+
+    .venv/bin/python -m pipenv run sh ./configure
+])])
 
 # required in Makefile to ensure proper path resolution during preprocessing
 # realpath is not available on macOS
@@ -23,6 +39,25 @@ AS_IF([test "$REALPATH" == "no"],
 alias='python3 -c "import pathlib,sys;print(pathlib.Path(sys.argv[[1]]).resolve())"'"
 ])])
 
+AC_MSG_CHECKING([for TWINE_PASSWORD])
+if test -z "$TWINE_PASSWORD"; then
+    AC_MSG_RESULT([no])
+    AC_MSG_WARN([
+TWINE_PASSWORD must be set to an API token of a PyPI account.
+])
+else
+    AC_MSG_RESULT([yes])
+fi
+
+AC_MSG_CHECKING([for BITBUCKET_ACCESS_TOKEN])
+if test -z "$BITBUCKET_ACCESS_TOKEN"; then
+    AC_MSG_RESULT([no])
+    AC_MSG_WARN([BITBUCKET_ACCESS_TOKEN not set])
+else
+    AC_MSG_RESULT([yes])
+fi
+
+
 sh -ex << 'EOF'
 uname
 git --version