1 files changed, 1 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index e636253..606e644 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,16 +8,17 @@ AM_INIT_AUTOMAKE([dist-bzip2])
 AC_PROG_INSTALL
 AC_PROG_CXX
 AC_PROG_CC
 AC_PROG_LIBTOOL
 PKG_PROG_PKG_CONFIG
 
 AC_HEADER_STDC
 AC_CHECK_FUNCS([timegm])
+AC_CHECK_HEADERS([ext/algorithm.h])
 
 AC_PATH_PROG([XSLTPROC],[xsltproc],[true])
 
 AC_MSG_CHECKING([for source tree version])
 if headrev=$(cd $srcdir && git rev-parse --verify HEAD 2>/dev/null) ; then
  PACKAGE_SRC_VERSION="$(cd $srcdir && git describe --tags $headrev)"
  test "$PACKAGE_SRC_VERSION" = "$PACKAGE_VERSION" \
   -o "${PACKAGE_SRC_VERSION#${PACKAGE_VERSION}-}" != "$PACKAGE_SRC_VERSION" || PACKAGE_SRC_VERSION="${PACKAGE_VERSION}:${PACKAGE_SRC_VERSION}"