$NetBSD$

Link with libbacktrace (if needed).

--- src/CMakeLists.txt.orig	2015-12-08 07:09:32.000000000 +0000
+++ src/CMakeLists.txt
@@ -65,8 +65,10 @@ add_library (otp STATIC otp.c)
 
 ## Program
 
+find_package(Backtrace)
+
 add_executable (openvasmd openvasmd.c ompd.c)
-target_link_libraries (openvasmd ovas-mngr-comm omp otp manage ${GNUTLS_LDFLAGS} ${GPGME_LDFLAGS} ${GCRYPT_LDFLAGS} ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries (openvasmd ovas-mngr-comm omp otp manage ${GNUTLS_LDFLAGS} ${GPGME_LDFLAGS} ${GCRYPT_LDFLAGS} ${CMAKE_THREAD_LIBS_INIT} ${Backtrace_LIBRARY})
 
 set_target_properties (openvasmd PROPERTIES LINKER_LANGUAGE C)