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here it stops, when i try to compile Gem from git:

which compiler (gcc-version) is this?

gcc --version gcc (GCC) 4.7.0 20120324 (prerelease)

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i pushed a change to Files.cpp that would include<unistd.h>, maybe this fixes the problem. please check (and tell us of success/failure)

Files.cpp problem dissapeared, but it seems that the same problem is in plugins/recordV4L2/recordV4L2.cpp i tried to include unistd.h and then it was ok

any more such problems or are those the only 2 occurences?

there is one more in src/Base/CPPExtern.cpp and maybe in some disabled features, like plugins(as it was in recordV4L2) or assimp ./configure --without-assimp plugins i compiled without this problem are gem_filmAVIPLAY.so gem_filmGMERLIN.so gem_filmMPEG3.so gem_filmQT4L.so gem_imageJPEG.so gem_imageMAGICK.so gem_imageSGI.so gem_imageTIFF.so gem_modelOBJ.so gem_recordQT4L.so gem_recordV4L.so gem_recordV4L2.so gem_videoDC1394.so gem_videoDV4L.so gem_videoUNICAP.so gem_videoV4L.so gem_videoV4L2.so gem_videoVLC.so