X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=m4%2Fopenvswitch.m4;h=e9edc4902311f69b2dbee048339622d38deae78c;hb=84095d268f41efd2754fb920b9e93b665f7b64ba;hp=e6d03a6bfb5dd473b7ab4068e9b4a0f30e3839a2;hpb=1269f7ae5f4bf23205de2cd45220b2382af78393;p=openvswitch

diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
index e6d03a6b..e9edc490 100644
--- a/m4/openvswitch.m4
+++ b/m4/openvswitch.m4
@@ -92,8 +92,7 @@ AC_DEFUN([OVS_CHECK_OPENSSL],
      [ssl=check])
 
    if test "$ssl" != false; then
-       dnl Make sure that pkg-config is installed.
-       m4_pattern_forbid([PKG_CHECK_MODULES])
+       m4_ifndef([PKG_CHECK_MODULES], [m4_fatal([Please install pkg-config.])])
        PKG_CHECK_MODULES([SSL], [openssl], 
          [HAVE_OPENSSL=yes],
          [HAVE_OPENSSL=no
@@ -152,6 +151,11 @@ AC_DEFUN([OVS_CHECK_LOGDIR],
      [LOGDIR='${localstatedir}/log/${PACKAGE}'])
    AC_SUBST([LOGDIR])])
 
+dnl Defines HAVE_BACKTRACE if backtrace() is declared in <execinfo.h>
+dnl and exists in libc.
+AC_DEFUN([OVS_CHECK_BACKTRACE],
+  [AC_CHECK_HEADER([execinfo.h], [AC_CHECK_FUNCS([backtrace])])])
+
 dnl Checks for __malloc_hook, etc., supported by glibc.
 AC_DEFUN([OVS_CHECK_MALLOC_HOOKS],
   [AC_CACHE_CHECK(