configure.ac: switch to POSIX sh behaviour

diff --git a/configure.ac b/configure.ac
index 393a53d7633a2d63c62d504ef92d28c7c2f377f8..e8f460109108df9df997eb04fae5475b36b55fe5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -3729,7 +3729,7 @@ if test "${with_nativecomp}" != "no"; then
     AC_CHECK_LIB(gccjit, gcc_jit_context_acquire, HAVE_NATIVE_COMP=yes))
   if test "${HAVE_NATIVE_COMP}" = "yes"; then
     LIBGCCJIT_LIB="-lgccjit -ldl"
-    COMP_OBJ+=comp.o
+    COMP_OBJ="comp.o"
     AC_DEFINE(HAVE_NATIVE_COMP, 1, [Define to 1 if you have the libgccjit library (-lgccjit).])
   else
     AC_MSG_ERROR([elisp native compiler requested but libgccjit not found.