configure: test for glibc backtrace even without glibc.

Other platform may have compatible facilities.

diff --git a/configure.ac b/configure.ac
index 75f99a6402b759564ae14fa45b2b20848698fd39..4ea873b22003311d584b2bc92d3b251358b66180 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -1440,14 +1440,12 @@ AC_SUBST(LIBCAP)
 dnl ---------------------------
 dnl check for glibc 'backtrace'
 dnl --------------------------- 
-if test "${glibc}" = "yes"; then
-   AC_CHECK_HEADER([execinfo.h],
-    [AC_CHECK_FUNC([backtrace],
-       [AC_DEFINE(HAVE_GLIBC_BACKTRACE,,[Glibc backtrace])
-        AC_DEFINE(HAVE_STACK_TRACE,,[Stack symbol decoding])
-       ])
-    ])
-fi
+AC_CHECK_HEADER([execinfo.h],
+  [AC_CHECK_FUNC([backtrace],
+    [AC_DEFINE(HAVE_GLIBC_BACKTRACE,,[Glibc backtrace])
+     AC_DEFINE(HAVE_STACK_TRACE,,[Stack symbol decoding])
+  ])
+])
 
 dnl -----------------------------------------
 dnl check for malloc mallinfo struct and call