Fix tdeioslaves FTBFS when compiled in standalone.

This resolves bug report 1617.

CMakeLists.txt

@@ -266,6 +266,7 @@ check_symbol_exists( gethostbyname2_r "netdb.h" HAVE_GETHOSTBYNAME2_R )
 check_symbol_exists( gethostbyname_r "netdb.h" HAVE_GETHOSTBYNAME_R )
 check_symbol_exists( gai_strerror "sys/types.h;sys/socket.h;netdb.h" HAVE_GAI_STRERROR )
 check_symbol_exists( getaddrinfo "sys/types.h;sys/socket.h;netdb.h" HAVE_GETADDRINFO )
+check_symbol_exists( backtrace "execinfo.h" HAVE_BACKTRACE )
 
 check_function_exists( usleep HAVE_USLEEP )
 check_symbol_exists( usleep "unistd.h" HAVE_USLEEP_PROTO )

config.h.cmake

@@ -48,7 +48,7 @@
 #cmakedefine HAVE_AWE_VOICE_H 1
 
 /* Define if execinfo.h exists and defines backtrace (GLIBC >= 2.1) */
-#undef HAVE_BACKTRACE
+#cmakedefine HAVE_BACKTRACE 1
 
 /* Define to 1 if you have the `bcopy' function. */
 #cmakedefine HAVE_BCOPY 1