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--- configure.ac.orig 2017-03-09 12:57:19.209816000 -0800
+++ configure.ac 2017-03-09 13:00:24.478539000 -0800
@@ -28,6 +28,10 @@ AC_PROG_CC_C99
if test "$ac_cv_prog_cc_c99" = no; then
AC_MSG_ERROR(cannot find a C99-compatible compiler)
fi
+AC_PROG_CXX
+if test "$ac_cv_prog_cxx" = no; then
+ AC_MSG_ERROR(cannot find a C++-compatible compiler)
+fi
AC_PROG_CPP
AC_PROG_INSTALL
@@ -97,6 +101,9 @@ AC_ARG_ENABLE(memcached,
[AS_HELP_STRING([--enable-memcached],
[enable memcached as a cache backend])])
+# Need to use C++ compiler for linking -lmemcached as static, rather than
+# hacking in GCC's -lstdc++, since we may be using Clang.
+AC_LANG(C++)
dnl enable-memcached: Check if -lmemcached is needed.
if test x${enable_memcached} != x; then
if test x${enable_static} != x; then
@@ -110,6 +117,7 @@ if test x${enable_memcached} != x; then
])
ccache_memcached='CCACHE_MEMCACHED=1 '
fi
+AC_LANG(C)
dnl Check for zlib
AC_ARG_WITH(bundled-zlib,
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