On 3 July 2011 21:46, Daniel Fischer
On Sunday 03 July 2011, 21:34:17, Christopher Done wrote:
I just had a quick try with cabal-install and got the below. I'm not sure where linux/posix_types is supposed to come from. Is this error obvious to you?
glibc-devel or the equivalent package for your distro, I think.
It turned out that I needed the linux development files from linux-libc-dev. FWIW to anyone, I'm on Ubuntu. The packages I installed were: sudo apt-get install linux-libc-dev sudo apt-get install libv4l-dev Then I got this problem: /home/chris/Programs/bin/ghc --make -o dist/build/v4l2-capture/v4l2-capture -hide-all-packages -fbuilding-cabal-package -package-conf dist/package.conf.inplace -i -idist/build/v4l2-capture/v4l2-capture-tmp -i. -idist/build/autogen -Idist/build/autogen -Idist/build/v4l2-capture/v4l2-capture-tmp -optP-include -optPdist/build/autogen/cabal_macros.h -odir dist/build/v4l2-capture/v4l2-capture-tmp -hidir dist/build/v4l2-capture/v4l2-capture-tmp -stubdir dist/build/v4l2-capture/v4l2-capture-tmp -package-id base-4.2.0.2-5fc3ebcb886ceae9a06b0bab7e8d4680 -package-id bindings-libv4l2-0.1-8dde216a9ec82cb90bbe93e20783ff8c -package-id bindings-linux-videodev2-0.1-7a032e0014085bf53e381d004d794b50 -package-id bindings-mmap-0.1-3144f93204d922458a3be21650b85f1f -package-id bindings-posix-1.2.2-00b879b119996c2d3acc7989dde2ba63 -package-id c-io-0.1.0-dcc629f98d0e4b2e0d55acbaaa6262b6 -package-id ioctl-0.0.1-60f1d8091a07bb23f1736fec7d2b4dd8 -O -Wall ./src/v4l2-capture.hs [1 of 1] Compiling Main ( src/v4l2-capture.hs, dist/build/v4l2-capture/v4l2-capture-tmp/Main.o ) Linking dist/build/v4l2-capture/v4l2-capture ... /usr/bin/ld: /home/chris/.cabal/lib/bindings-posix-1.2.2/ghc-6.12.3/libHSbindings-posix-1.2.2.a(Signal.o):(.text+0x5dfb): error: undefined reference to 'pthread_kill' /usr/bin/ld: /home/chris/.cabal/lib/bindings-posix-1.2.2/ghc-6.12.3/libHSbindings-posix-1.2.2.a(Signal.o):(.text+0x5ee2): error: undefined reference to 'pthread_kill' /usr/bin/ld: /home/chris/.cabal/lib/bindings-posix-1.2.2/ghc-6.12.3/libHSbindings-posix-1.2.2.a(Signal.o):(.text+0x5f87): error: undefined reference to 'pthread_sigmask' /usr/bin/ld: /home/chris/.cabal/lib/bindings-posix-1.2.2/ghc-6.12.3/libHSbindings-posix-1.2.2.a(Signal.o):(.text+0x6092): error: undefined reference to 'pthread_sigmask' collect2: ld returned 1 exit status cabal: Error: some packages failed to install: v4l2-examples-0.1 failed during the building phase. The exception was: ExitFailure 1 chris@cn-done:~/v4l2-examples-0.1$ But I solved it by adding -lpthread: chris@cn-done:~/v4l2-examples-0.1$ /home/chris/Programs/bin/ghc --make -o dist/build/v4l2-capture/v4l2-capture -hide-all-packages -fbuilding-cabal-package -package-conf dist/package.conf.inplace -i -idist/build/v4l2-capture/v4l2-capture-tmp -i. -idist/build/autogen -Idist/build/autogen -Idist/build/v4l2-capture/v4l2-capture-tmp -optP-include -optPdist/build/autogen/cabal_macros.h -odir dist/build/v4l2-capture/v4l2-capture-tmp -hidir dist/build/v4l2-capture/v4l2-capture-tmp -stubdir dist/build/v4l2-capture/v4l2-capture-tmp -package-id base-4.2.0.2-5fc3ebcb886ceae9a06b0bab7e8d4680 -package-id bindings-libv4l2-0.1-8dde216a9ec82cb90bbe93e20783ff8c -package-id bindings-linux-videodev2-0.1-7a032e0014085bf53e381d004d794b50 -package-id bindings-mmap-0.1-3144f93204d922458a3be21650b85f1f -package-id bindings-posix-1.2.2-00b879b119996c2d3acc7989dde2ba63 -package-id c-io-0.1.0-dcc629f98d0e4b2e0d55acbaaa6262b6 -package-id ioctl-0.0.1-60f1d8091a07bb23f1736fec7d2b4dd8 -O -Wall ./src/v4l2-capture.hs -lpthread Linking dist/build/v4l2-capture/v4l2-capture ... chris@cn-done:~/v4l2-examples-0.1$ I guess on Claude's system it's linked to by default. So for guys trying the examples with that error I'd recommend the following commandline: cabal install v4l2-examples --ghc-option=-lpthread Can't really play about with the webcam right now but I'd had a small but cool project I've had in mind for a while that v4l is perfectly suited for, so I'll get back to you with my experiences. Thanks for releasing it, Claude. :-) Ciao!