Changes are in bold text.

include(confBUILDTOOLSDIR`/M4/switch.m4')

define(`confREQUIRE_LIBSM', `true')

dnl Enable these lines to make use of the provided asynchronous resolver:
bldPUSH_SMLIB(`ar')
APPENDDEF(`confENVDEF', `-DUSE_ARLIB ')
APPENDDEF(`confINCDIRS', `-I../libar/ ')

dnl Enable and edit this as appropriate for your system:
APPENDDEF(`confINCDIRS', `-I/usr/include/openssl ')

define(`confMT', `true')

bldPRODUCT_START(`library', `libdk')
define(`bldSOURCES', `dk.c rfc2822.c util.c ')
bldPRODUCT_END

bldFINISH