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-rw-r--r--configure.ac3
1 files changed, 3 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 3cd4e0b..2e56b74 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,8 +24,11 @@ LT_INIT
AC_PROG_CXX
AC_PROG_CC
AC_PROG_CC_C99
+AC_PROG_GREP
AC_PROG_INSTALL
+AM_CONDITIONAL(CLANG, [$CXX --version | $GREP clang >/dev/null])
+
AC_CHECK_PROG(DATE, date, date)
if [[ x$DATE = x ]]; then
AC_MSG_ERROR([Required tool date not found!])