Index: google-glog/configure.ac
===================================================================
--- google-glog.orig/configure.ac 2010-07-26 13:09:42.000000000 +0900
+++ google-glog/configure.ac 2010-07-26 13:10:24.000000000 +0900
@@ -34,7 +34,7 @@
# For backtrace with glibc.
AC_CHECK_HEADERS(execinfo.h)
# For backtrace with libunwind.
-AC_CHECK_HEADERS(libunwind.h)
+AC_CHECK_HEADERS(libunwind.h, ac_cv_have_libunwind_h=1, ac_cv_have_libunwind_h=0)
AC_CHECK_HEADERS(ucontext.h)
AC_CHECK_HEADERS(sys/utsname.h)
AC_CHECK_HEADERS(pwd.h)