from http://www.pjsip.org/using.htm#gnu_configure > Configuring Debug Version and Other Customizations > > The configure script accepts standard customization, which details > can be obtained by executing ./configure --help. > > Below is an example of specifying CFLAGS in configure: > > $ ./configure CFLAGS="-O3 -DNDEBUG -msoft-float -fno-builtin" $ ./configure CFLAGS="-O3 -DNDEBUG -msoft-float -fno-builtin" aconfigure: error: unrecognized option: -DNDEBUG Try `./aconfigure --help' for more information. Sorry - I'm not a Makefile expert - how can I build with debug symbols? thanks klaus