pkg_config: add vmaf to Requires if enabled

Signed-off-by: Christopher Degawa <christopher.degawa@intel.com>
Change-Id: Icb27770cf282848f6087c2ea0e00637bcf257f41
(cherry picked from commit 0d36ee380b206bd9b611f16e2145969e8f76a023)
diff --git a/build/cmake/aom_install.cmake b/build/cmake/aom_install.cmake
index e22fc8a..bcc0ab5 100644
--- a/build/cmake/aom_install.cmake
+++ b/build/cmake/aom_install.cmake
@@ -38,14 +38,17 @@
     add_custom_command(
       OUTPUT "${AOM_PKG_CONFIG_FILE}"
       COMMAND ${CMAKE_COMMAND} ARGS
-              -DAOM_CONFIG_DIR=${AOM_CONFIG_DIR} -DAOM_ROOT=${AOM_ROOT}
+              -DAOM_CONFIG_DIR=${AOM_CONFIG_DIR}
+              -DAOM_ROOT=${AOM_ROOT}
               -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
               -DCMAKE_INSTALL_BINDIR=${CMAKE_INSTALL_BINDIR}
               -DCMAKE_INSTALL_INCLUDEDIR=${CMAKE_INSTALL_INCLUDEDIR}
               -DCMAKE_INSTALL_LIBDIR=${CMAKE_INSTALL_LIBDIR}
               -DCMAKE_PROJECT_NAME=${CMAKE_PROJECT_NAME}
               -DCONFIG_MULTITHREAD=${CONFIG_MULTITHREAD}
-              -DHAVE_PTHREAD_H=${HAVE_PTHREAD_H} -P
+              -DCONFIG_TUNE_VMAF=${CONFIG_TUNE_VMAF}
+              -DHAVE_PTHREAD_H=${HAVE_PTHREAD_H}
+              -P
               "${AOM_ROOT}/build/cmake/pkg_config.cmake"
       COMMENT "Writing aom.pc"
       VERBATIM)
diff --git a/build/cmake/pkg_config.cmake b/build/cmake/pkg_config.cmake
index c3914d7..4466cbb 100644
--- a/build/cmake/pkg_config.cmake
+++ b/build/cmake/pkg_config.cmake
@@ -51,8 +51,11 @@
   APPEND "${pkgconfig_file}"
   "Description: Alliance for Open Media AV1 codec library v${aom_version}.\n")
 file(APPEND "${pkgconfig_file}" "Version: ${package_version}\n")
-file(APPEND "${pkgconfig_file}" "Requires:\n")
-file(APPEND "${pkgconfig_file}" "Conflicts:\n")
+file(APPEND "${pkgconfig_file}" "Requires:")
+if(CONFIG_TUNE_VMAF)
+  file(APPEND "${pkgconfig_file}" " libvmaf")
+endif()
+file(APPEND "${pkgconfig_file}" "\nConflicts:\n")
 file(APPEND "${pkgconfig_file}" "Libs: -L\${libdir} -l${pkg_name}\n")
 if(CONFIG_MULTITHREAD AND HAVE_PTHREAD_H)
   file(APPEND "${pkgconfig_file}" "Libs.private: -lm -lpthread\n")