1 files changed, 0 insertions, 54 deletions
diff --git a/m4/diff.m4 b/m4/diff.m4
deleted file mode 100644
index daa1ecf..0000000
--- a/m4/diff.m4
+++ /dev/null
@@ -1,54 +0,0 @@
-dnl file      : m4/diff.m4
-dnl copyright : Copyright (c) 2013-2017 Code Synthesis Tools CC
-dnl license   : MIT; see accompanying LICENSE file
-dnl
-dnl DIFF_TOOL
-dnl
-AC_DEFUN([DIFF_TOOL], [
-diff_found=no
-
-AC_ARG_VAR([DIFF],[diff command])
-AC_ARG_VAR([DIFFFLAGS],[diff flags])
-
-AC_ARG_WITH(
-  [diff],
-  [AC_HELP_STRING([--with-diff=PATH],[path to the diff program])],
-  [diff_path=${withval}],
-  [diff_path=])
-
-AC_MSG_CHECKING([for diff])
-
-if test x"$DIFF" = x; then
- if test x"$diff_path" != x; then
-   AS_SET_CATFILE([abs_diff_path], [$ac_pwd], [$diff_path])
-   DIFF="$abs_diff_path"
- else
-   DIFF=diff
- fi
-fi
-
-cat >conftest.txt
-
-$DIFF conftest.txt conftest.txt 2>/dev/null 1>&2
-
-if test x"$?" = x0; then
-  AC_MSG_RESULT([$DIFF])
-else
-  AC_MSG_RESULT([no])
-  AC_MSG_ERROR([diff command is not found; consider setting the DIFF variable or using --with-diff=PATH])
-fi
-
-AC_MSG_CHECKING([whether $DIFF accepts -u])
-
-$DIFF -u conftest.txt conftest.txt 2>/dev/null 1>&2
-
-if test x"$?" = x0; then
-  AC_MSG_RESULT([yes])
-  DIFFFLAGS="$DIFFFLAGS -u"
-else
-  AC_MSG_RESULT([no])
-fi
-
-rm -f conftest.txt
-
-])dnl