The cygwin time-machine works and I am able to compile lyx.
Problems: 1. line 121-125 (_POSIX_THREAD_SAFE_FUNCTIONS_) in -boost/libs/filesystem/src/operations_posix_windows.cpp causes compile error, so I have to comment them out. 2. make install fails with /usr/bin/install -c -m 644 '../../../lib/doc/mobius.eps' '/usr/local/share/lyx/ doc/mobius.eps' /usr/bin/install -c -m 644 '../../../lib/doc/platypus.eps' '/usr/local/share/ly x/doc/platypus.eps' make install-data-hook make[4]: Entering directory `/cygdrive/d/bpeng/lyx-cygwin/build-x11/lib/doc' python ../../../lib/doc/doc_toc.py Traceback (most recent call last): File "../../../lib/doc/doc_toc.py", line 34, in ? import LyX File "../../../lib/doc/../lyx2lyx/LyX.py", line 28, in ? import lyx2lyx_version ImportError: No module named lyx2lyx_version make[4]: *** [TOC.lyx] Error 1 make[4]: Leaving directory `/cygdrive/d/bpeng/lyx-cygwin/build-x11/lib/doc' make[3]: *** [install-data-am] Error 2 make[3]: Leaving directory `/cygdrive/d/bpeng/lyx-cygwin/build-x11/lib/doc' make[2]: *** [install-am] Error 2 make[2]: Leaving directory `/cygdrive/d/bpeng/lyx-cygwin/build-x11/lib/doc' make[1]: *** [install-recursive] Error 1 make[1]: Leaving directory `/cygdrive/d/bpeng/lyx-cygwin/build-x11/lib' make: *** [install-recursive] Error 1 $ /usr/local/bin/lyx Unable to determine the system directory having searched /usr/local/share/lyx/ Use the '-sysdir' command line parameter or set the environment variable LYX_DIR _14x to the LyX system directory containing the file `chkconfig.ltx'. Bo