Add without_compat_opencv_pc with conditional

opencv.spec

@@ -327,7 +327,6 @@ popd
  -DWITH_OPENMP=ON \
  -DOPENCV_CONFIG_INSTALL_PATH=%{_lib}/cmake/OpenCV \
  -DOPENCV_GENERATE_PKGCONFIG=ON \
- -DOPENCV_PC_FILE_NAME=opencv.pc \
  %{?with_gdcm: -DWITH_GDCM=ON } \
  %{?with_libmfx: -DWITH_MFX=ON } \
  %{?with_clp: -DWITH_CLP=ON } \
@@ -354,6 +353,11 @@ ln -s -r %{buildroot}%{_jnidir}/opencv-%{javaver}.jar %{buildroot}%{_jnidir}/ope
 ln -s opencv4/opencv2 %{buildroot}%{_includedir}
 ln -s opencv4 %{buildroot}%{_datadir}/opencv
 
+# For compatibility with existing opencv.pc application
+%{!?without_compat_openvc_pc:
+  ln -s opencv4.pc %{buildroot}%{_libdir}/pkgconfig/opencv.pc
+}
+
 
 %check
 # Check fails since we don't support most video
@@ -417,7 +421,10 @@ popd
 %dir %{_includedir}/opencv4
 %{_includedir}/opencv4/opencv2
 %{_libdir}/lib*.so
+%{!?without_compat_openvc_pc:
 %{_libdir}/pkgconfig/opencv.pc
+}
+%{_libdir}/pkgconfig/opencv4.pc
 %{_libdir}/cmake/OpenCV/*.cmake
 
 %files doc