CXXFLAGS_FOR_TARGET="$(CXXFLAGS_FOR_TARGET)" \
                OFILES="$(OFILES)" BFDLIB="$(TESTBFDLIB)" CTFLIB="$(TESTCTFLIB) $(ZLIB)" \
                SFRAMELIB="$(TESTSFRAMELIB)" \
+               JANSSON_LIBS="$(JANSSON_LIBS)" ZSTD_LIBS="$(ZSTD_LIBS)" \
                LIBIBERTY="$(LIBIBERTY) $(LIBINTL)" LIBS="$(LIBS)" \
                DO_COMPARE="`echo '$(do_compare)' | sed -e 's,\\$$,,g'`" \
                $(RUNTESTFLAGS); \
 
                CXXFLAGS_FOR_TARGET="$(CXXFLAGS_FOR_TARGET)" \
                OFILES="$(OFILES)" BFDLIB="$(TESTBFDLIB)" CTFLIB="$(TESTCTFLIB) $(ZLIB)" \
                SFRAMELIB="$(TESTSFRAMELIB)" \
+               JANSSON_LIBS="$(JANSSON_LIBS)" ZSTD_LIBS="$(ZSTD_LIBS)" \
                LIBIBERTY="$(LIBIBERTY) $(LIBINTL)" LIBS="$(LIBS)" \
                DO_COMPARE="`echo '$(do_compare)' | sed -e 's,\\$$,,g'`" \
                $(RUNTESTFLAGS); \
 
     }
 
     if { [lindex [remote_exec build grep "-q \"HAVE_ZSTD 1\" config.h" ] 0] == 0 } then {
-       set extralibs "$extralibs -lzstd"
+       set extralibs "$extralibs $ZSTD_LIBS"
     }
 
     # Check if the system's jansson library is used. If so, the object files will
     # be using symbols from it, so link to it.
     if { [lindex [remote_exec build grep "-q \"HAVE_JANSSON 1\" config.h" ] 0] == 0 } then {
-       set extralibs "$extralibs -ljansson"
+       set extralibs "$extralibs $JANSSON_LIBS"
     }
 
     # Plugin support requires linking with libdl.