2020-11-22 04:10:50 -0500 received badge ● Popular Question (source) 2015-08-03 11:39:50 -0500 asked a question Raspberry Pi C Program with OpenCV - cvGrabeFrame linking error I have been trying, unsuccessfully, to compile my c program for using openCV on the linux-based operating system run on Raspberry Pi, Raspbian. The goal is to interface with the RPi camera, incorporating OpenCV. I have searched similar errors but only found mentions of C++ programs with this specific problem. I do not want this in C++, I want to solve the problem using C programming. I am compiling a file ending in .c with the following command in the linux LXTerminal: gcc -o testcode testcode.c -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_features2d -lopencv_objdetect I get the following errors: /usr/bin/ld: /tmp/ccxluxYC.o: undefined reference to symbol 'cvGrabFrame' //usr/local/lib/libopencv_videoio.so.3.0: error adding symbols: DSO missing from command line collect2: ld returned 1 exit status I would assume that I am not linking with a library. Any suggestions? Additionally, how do I link with DSO in the command line? Thanks! 2015-08-03 11:30:51 -0500 commented question Undefined reference error while compiling a C program on Raspberry Pi I'm still having issues linking to 'cvGrabFrame'... any ideas? 2015-08-03 09:54:53 -0500 commented question Undefined reference error while compiling a C program on Raspberry Pi I'm using opencv 3.0, and cmake version 2.8, is this the same for this version? 2015-08-03 09:37:20 -0500 commented question Undefined reference error while compiling a C program on Raspberry Pi I've got it down to one undefined reference now, with those links to opencv libs. Now, my output is the following: /usr/bin/ld: /tmp/ccAyCfME.o: undefined reference to symbol 'cvGrabFrame' //usr/local/lib/libopencv_videoio.so.3.0: error adding symbols: DSO missing from command line collect2: ld returned 1 exit status 2015-08-03 09:15:57 -0500 commented question Undefined reference error while compiling a C program on Raspberry Pi berak, What is the statement needed to include those opencv libs? I'm having difficulty finding these. 2015-08-03 08:56:34 -0500 asked a question Undefined reference error while compiling a C program on Raspberry Pi I have been trying, unsuccessfully, to compile my c program for using openCV on the linux-based operating system run on Raspberry Pi, Raspbian. The goal is to interface with the RPi camera, incorporating OpenCV. I have searched similar errors but only found mentions of C++ programs with this specific problem. I do not want this in C++, I want to solve the problem using C programming. I am compiling a file ending in .c with the following command in the linux LXTerminal: gcc -o testcode testcode.c I repeatedly get the follow errors: /tmp/cclhjysk.o: In function cvDecRefData': testcode.c:(.text+0xe84): undefined reference tocvFree_' testcode.c:(.text+0xf2c): undefined reference to cvFree_' /tmp/cclhjysk.o: In function cvGetRow': testcode.c:(.text+0x10c4): undefined reference to cvGetRows' /tmp/cclhjysk.o: In function cvGetCol': testcode.c:(.text+0x1104): undefined reference to cvGetCols' /tmp/cclhjysk.o: In function cvReleaseMatND': testcode.c:(.text+0x112c): undefined reference to cvReleaseMat' /tmp/cclhjysk.o: In functioncvSubS': testcode.c:(.text+0x12f8): undefined reference to cvAddS' /tmp/cclhjysk.o: In functioncvCloneSeq': testcode.c:(.text+0x1344): undefined reference to cvSeqSlice' /tmp/cclhjysk.o: In function cvSetNew': testcode.c:(.text+0x13cc): undefined reference to cvSetAdd' /tmp/cclhjysk.o: In function cvGetSetElem': testcode.c:(.text+0x149c): undefined reference to cvGetSeqElem' /tmp/cclhjysk.o: In function cvReadIntByName': testcode.c:(.text+0x1584): undefined reference to cvGetFileNodeByName' /tmp/cclhjysk.o: In function cvReadRealByName': testcode.c:(.text+0x1670): undefined reference to cvGetFileNodeByName' /tmp/cclhjysk.o: In function cvReadStringByName': testcode.c:(.text+0x1718): undefined reference to cvGetFileNodeByName' /tmp/cclhjysk.o: In function cvReadByName': testcode.c:(.text+0x1764): undefined reference to cvGetFileNodeByName' testcode.c:(.text+0x1778): undefined reference tocvRead' /tmp/cclhjysk.o: In function cvContourPerimeter': testcode.c:(.text+0x17c0): undefined reference tocvArcLength' /tmp/cclhjysk.o: In function cvCalcHist': testcode.c:(.text+0x1800): undefined reference tocvCalcArrHist' /tmp/cclhjysk.o: In function cvEllipseBox': testcode.c:(.text+0x1908): undefined reference tocvEllipse' /tmp/cclhjysk.o: In function cvFont': testcode.c:(.text+0x1970): undefined reference tocvInitFont' /tmp/cclhjysk.o: In function main': testcode.c:(.text+0x1a0c): undefined reference tocvCreateCameraCapture' testcode.c:(.text+0x1a20): undefined reference to SetCaptureProperty' testcode.c:(.text+0x1a30): undefined reference toSetCaptureProperty' testcode.c:(.text+0x1a40): undefined reference to SetCaptureProperty' testcode.c:(.text+0x1a50): undefined reference toSetCaptureProperty' testcode.c:(.text+0x1a70): undefined reference to cvRetrieveFrame' testcode.c:(.text+0x1a7c): undefined reference tocvGrabFrame' testcode.c:(.text+0x1a90): undefined reference to `cvGrabFramed' collect2: ld returned 1 exit status I have searched through my RPi for files with mention of cvFree and have been unable to locate them, so I'm thinking that I might be missing a step in the download or excluding a header. I have the following header files: stdlib.h stdio.h math.h opencv/cv.h opencv/highgui.h opencv/cvaux.h Note: All the include statements are preceded with a pound/hashtag and the word "include," in addition to being surrounded by "<>" brackets. I use the following calls (variable types only included in parameters ...