X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/e79137accc7ea0352cd4677ff22818f9c68d4eab..19c50364f38b72dcd7bf67a998db3c815b7b6a94:/m4/atconfig.m4

diff --git a/m4/atconfig.m4 b/m4/atconfig.m4
index 4dd5c580..f4a4de49 100644
--- a/m4/atconfig.m4
+++ b/m4/atconfig.m4
@@ -2,12 +2,21 @@
 ## Prepare for testing.  ##
 ## ----------------------##
 
-# serial 1
+# serial 2
 
 # Single argument says where are built sources to test, relative to the
 # built test directory.  Maybe omitted if the same (flat distribution).
 
-AC_DEFUN(AT_CONFIG,
-[AT_TESTPATH=ifelse($1, , ., $1)
-AC_SUBST(AT_TESTPATH)
+AC_DEFUN([AT_CONFIG],
+[AT_TESTPATH=ifelse([$1], [], [.], [$1])
+AC_SUBST([AT_TESTPATH])
+# Try to be compatible with both Autoconf 2.13 and 2.50.
+if test -z "$ECHO_C$ECHO_N$ECHO_T"; then
+  ECHO_C="$ac_c"
+  ECHO_N="$ac_n"
+  ECHO_T="$ac_t"
+  AC_SUBST([ECHO_C])
+  AC_SUBST([ECHO_N])
+  AC_SUBST([ECHO_T])
+fi
 ])