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-rw-r--r--m4/libevent_openssl.m45
1 files changed, 5 insertions, 0 deletions
diff --git a/m4/libevent_openssl.m4 b/m4/libevent_openssl.m4
index 19811981..a5ea6762 100644
--- a/m4/libevent_openssl.m4
+++ b/m4/libevent_openssl.m4
@@ -47,6 +47,11 @@ case "$enable_openssl" in
AC_SUBST(OPENSSL_LIBS)
case "$have_openssl" in
yes) AC_DEFINE(HAVE_OPENSSL, 1, [Define if the system has openssl]) ;;
+ *) AC_MSG_ERROR([openssl is a must but can not be found. You should add the \
+directory containing `openssl.pc' to the `PKG_CONFIG_PATH' environment variable, \
+or set `CFLAGS' and `LDFLAGS' directly for openssl, or use `--disable-openssl' \
+to disable support for openssl encryption])
+ ;;
esac
;;
esac