From your question I guess you are using Ubuntu (or a derivate). If you use: apt-file search opencv.pc then you see that you have to install libopencv-dev. After you do so, pkg-config –cflags opencv and pkg-config –libs opencv should work as expected.
One significant problem with PKG_CHECK_MODULES is that it causes failures where it should not. If a user installs libfoo in /p/a/t/h and invokes a configure script with LDFLAGS=-L/p/a/t/h, the user is justified in expecting the configury to find libfoo. But, the user also must set PKG_CONFIG_PATH so that the configure script can find foo.pc in … Read more
This is a step-by-step procedure to get pkg-config working on Windows, based on my experience, using the info from Oliver Zendel’s comment. I assume here that MinGW was installed to C:\MinGW. There were multiple versions of the packages available, and in each case I just downloaded the latest version. go to http://ftp.gnome.org/pub/gnome/binaries/win32/dependencies/ download the file … Read more
First of, the call: include(FindPkgConfig) should be replaced with: find_package(PkgConfig) The find_package() call is more flexible and allows options such as REQUIRED, that do things automatically that one would have to do manually with include(). Secondly, manually calling pkg-config should be avoid when possible. CMake comes with a rich set of package definitions, found in … Read more