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Gerhard Jäger authored
added linker option -lpthread if pthread.h is found * include/sane/config.in.h: added HAVE_PTHREAD_H * sanei/sanei_thread.c include/sane/sanei_thread.h: added pthread_ functions to library, so every backend is able to use either fork or pthread for its reader-process - see plustek backend for example * backend/plustek.h backend/plustek.c: added sanei_thread stuff to support threading on MacOS X * backend/plustek_pp*: some cleanup
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