--- /dev/null
+# SPDX-License-Identifier: MIT
+#
+# Copyright (C) 2021 Michael Jeanson <mjeanson@efficios.com>
+#
+# ae_in_git_repo.m4 -- Check if we are building from the git repo
+#
+# The cache variable for this test is `ae_cv_in_git_repo`.
+#
+# AE_IF_IN_GIT_REPO(ACTION-IF-TRUE, [ACTION-IF-FALSE])
+# ---------------------------------------------------------------------------
+AC_DEFUN([AE_IF_IN_GIT_REPO], [
+ AC_CACHE_VAL([ae_cv_in_git_repo], [
+
+ dnl We're in the Git repository; the `bootstrap` file
+ dnl is not distributed in tarballs
+ AS_IF([test -f "$srcdir/bootstrap"],
+ [ae_cv_in_git_repo=yes],
+ [ae_cv_in_git_repo=no])
+ ])
+
+ AS_IF([test "x$ae_cv_in_git_repo" = "xyes"], [dnl
+ $1
+ ], [: dnl
+ $2
+ ])
+])