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-rw-r--r--configure.ac6
1 files changed, 5 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index dfd7a495bb..a85d530bed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -441,7 +441,11 @@ AM_CONDITIONAL(BUILD_MANPAGE, [test "x$enable_manpage" != "xno"])
AM_CONDITIONAL(BUILD_HTML_DOCS, [test "x$enable_html_manual" != "xno"])
AM_PROG_CC_C_O
-AC_PROG_CC_C99
+
+dnl Before autoconf 2.70, AC_PROG_CC_C99 is supposedly necessary for some
+dnl compilers if you wan't C99 support. Starting with 2.70, it is obsolete and
+dnl forbidden.
+m4_version_prereq([2.70], [:], [AC_PROG_CC_C99])
AC_CACHE_CHECK([for Python 3], [tor_cv_PYTHON],
[AC_PATH_PROGS_FEATURE_CHECK([PYTHON], [ \