The `test` builtin/binary usually accepts `==` for string comparison, it is mostly accepted for typos and people being used to double equals, but is not documented and not always accepted either. Since autoconf uses the default shell, it might just fail in some cases with: ./configure: 29986: test: xrustc: unexpected operator ./configure: 29990: test: xcargo: unexpected operator Just change it to single equals as it is done everywhere else. Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- m4/guestfs-rust.m4 | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/m4/guestfs-rust.m4 b/m4/guestfs-rust.m4 index aa12a9ef5e5d..1dffd8118874 100644 --- a/m4/guestfs-rust.m4 +++ b/m4/guestfs-rust.m4 @@ -24,8 +24,8 @@ AS_IF([test "x$enable_rust" != "xno"],[ AC_CHECK_PROG([RUSTC],[rustc],[rustc],[no]) AC_CHECK_PROG([CARGO],[cargo],[cargo],[no]) - AS_IF([test "x$RUSTC" == "xno"], [AC_MSG_WARN([rustc not found])]) - AS_IF([test "x$CARGO" == "xno"], [AC_MSG_WARN([cargo not found])]) + AS_IF([test "x$RUSTC" = "xno"], [AC_MSG_WARN([rustc not found])]) + AS_IF([test "x$CARGO" = "xno"], [AC_MSG_WARN([cargo not found])]) ],[ RUSTC=no CARGO=no -- 2.31.1