OpenCV build error - opencv

Question

If this is not out of place here, would like to know about the source and fix for an error I get when I am building OpenCV under Cygwin (On Windows 7 64 bit).
I have Cygwin installed with MingW- pthread pacgae installed in that cygwin installation.
I have downloaded OpenCV ver. 2.3.1 source package.
EDIT:
After some tweaks, and changes to build process OpenCV builds fine now.
But when I compile a simple test openCV code(C source code), as below it gives lot of linker errors of undefined references to many basic openCV functions. I tried setting LD_LIBRARY_PATH correctly but still errors persit:
cc -L/usr/local/lib -I/usr/local/include/opencv2 -/usr/local/include/opencv -lop encv_imgproc -lopencv_highgui -lopencv_video -lopencv_calib3d test1.c -o test_op encv
cc: unrecognized option '-/usr/local/include/opencv'
/tmp/ccfEqFK0.o:test1.c:(.text+0x9dd): undefined reference to `_cvFree_'
/tmp/ccfEqFK0.o:test1.c:(.text+0xa4e): undefined reference to `_cvFree_'
/tmp/ccfEqFK0.o:test1.c:(.text+0xb44): undefined reference to `_cvGetRows'
/tmp/ccfEqFK0.o:test1.c:(.text+0xb6f): undefined reference to `_cvGetCols'
/tmp/ccfEqFK0.o:test1.c:(.text+0xb82): undefined reference to `_cvReleaseMat'
/tmp/ccfEqFK0.o:test1.c:(.text+0xcd2): undefined reference to `_cvAddS'
/tmp/ccfEqFK0.o:test1.c:(.text+0x1137): undefined reference to `_cvRead'
/tmp/ccfEqFK0.o:test1.c:(.text+0x11e1): undefined reference to `_cvLoadImage'
/tmp/ccfEqFK0.o:test1.c:(.text+0x129d): undefined reference to `_cvCreateImage'
/tmp/ccfEqFK0.o:test1.c:(.text+0x12dd): undefined reference to `_cvResize'
/tmp/ccfEqFK0.o:test1.c:(.text+0x12f1): undefined reference to `_cvNamedWindow'
/tmp/ccfEqFK0.o:test1.c:(.text+0x1305): undefined reference to `_cvNamedWindow'
'
/tmp/ccfEqFK0.o:test1.c:(.text+0x13ad): undefined reference to `_cvDestroyWindow
... ... Many more undefined references.
'
collect2: ld returned 1 exit status
Makefile:10: recipe for target `test_opencv' failed
make: *** [test_opencv] Error 1
EDIT
Below message is still there, but it is not an error but a message during build process.
*Then while building OpenCV under cygwin, when I do make , it gives a error message
c++: unrecognized option '-pthread'
[ 36%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/grfmt_sunras.o*
and for many other files i see the same error c++: unrecognized option '-pthread'
I would like to know if anyone has experience in building openCV under Cygwin , how to get OpenCV going under cygwin? . Now I know there is windows setup for OpenCV but that is not what is an option to me.

Answer 1

Your cmd line arguments has a few problems. It seems that it was not fully pasted in your question (some indentation problems suggests so).
One obvious mistake can be easily identified since CC is telling you about it: cc: unrecognized option '-/usr/local/include/opencv':
When adding headers directories in the command line, you must specify each of them with -I. Notice how you failed to do so with: -/usr/local/include/opencv. It should be -I/usr/local/include/opencv
You also seem to be missing -lopencv_core in the cmd-line
In the future, use pkg-config (if its properly configured) to help you include opencv headers and libraries:
cc test.c -o test_op `pkg-config --cflags --libs opencv` -lop

Answer 2

Thanks for pointers:
What I found was the problem was as follows:
In my Makefile of my openCV test app I was linking with the import libraries (*.a). Which was the problem.
Problematic Makefile was linking against files
-l:/usr/local/lib/libopencv_core.dll.a ...etc...
I changed that to link with actual dll libs, then it worked(linked) fine, w/o any errors as above.
Changes Makefile looks:
LIBS = -l:/usr/local/bin/cygopencv_core-2.3.dll -l:/usr/local/bin/cygopencv_imgproc-2.3.dll -l:/usr/local/bin/cygopencv_highgui-2.3.dll -l:/usr/local/bin/cygopencv_video-2.3.dll -l:/usr/local/bin/cygopencv_calib3d-2.3.dll