configure script check for libev version 4 or greater

diff --git a/citadel/configure.ac b/citadel/configure.ac
index aa19866afcc29fc0e4406bd655cd2d8b58760144..0ac40df44f1e58cb3bb6ee18f60273a39fe8a1cd 100644 (file)
--- a/citadel/configure.ac
+++ b/citadel/configure.ac
@@ -582,7 +582,7 @@ AC_CHECK_LIB(cares, ares_init,
 
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS $SERVER_LIBS"
-dnl Check for libevent
+dnl Check for c-ares
 AC_CHECK_HEADER(ares.h,
        [AC_CHECK_LIB(cares, ares_init,
                [
@@ -600,7 +600,7 @@ CFLAGS="$saved_CFLAGS"
 
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS $SERVER_LIBS"
-dnl Check for libevent
+dnl Check for libev
 AC_CHECK_HEADER(ev.h,
        [AC_CHECK_LIB(ev, libcitadel_version_string,
                [
@@ -617,6 +617,26 @@ AC_CHECK_HEADER(ev.h,
 )
 CFLAGS="$saved_CFLAGS"
 
+AC_MSG_CHECKING(Checking version of libev)
+AC_TRY_RUN([
+       #include <ev.h>
+       main() {
+               printf("libev is version %d.%d\n", ev_version_major(), ev_version_minor());
+               if (ev_version_major() >= 4) {
+                       exit(0);
+               }
+       exit(1);
+       }
+ ],
+               [
+                       AC_MSG_RESULT(This will do just fine, thank you)
+               ],
+               [ 
+                       AC_MSG_ERROR(Citadel requires a newer version of libev.  More info: http://www.citadel.org/doku.php/installation:start)
+               ]
+)
+
+
 # The big search for OpenSSL
 if test "$with_ssl" != "no"; then
        saved_LIBS="$LIBS"