build BUGFIX use custom lib dir in pkgconfig path too
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa6dc2a..46b80b8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -103,14 +103,14 @@
 if(PKG_CONFIG_FOUND)
 	# generate and install pkg-config file
 	configure_file("libyang.pc.in" "libyang.pc" @ONLY)
-	install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libyang.pc" DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig")
+	install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libyang.pc" DESTINATION "${CMAKE_INSTALL_PREFIX}/${LIB_INSTALL_DIR}/pkgconfig")
 	# check that pkg-config includes the used path
 	execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --variable pc_path pkg-config RESULT_VARIABLE RETURN OUTPUT_VARIABLE PC_PATH ERROR_QUIET)
 	if(RETURN EQUAL 0)
-		string(REGEX MATCH "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig" SUBSTR "${PC_PATH}")
+		string(REGEX MATCH "${CMAKE_INSTALL_PREFIX}/${LIB_INSTALL_DIR}/pkgconfig" SUBSTR "${PC_PATH}")
 		string(LENGTH "${SUBSTR}" SUBSTR_LEN)
 		if(SUBSTR_LEN EQUAL 0)
-			message(WARNING "pkg-config will not detect the new package after installation, adjust PKG_CONFIG_PATH using \"export PKG_CONFIG_PATH=\${PKG_CONFIG_PATH}:${CMAKE_INSTALL_PREFIX}/lib/pkgconfig\".")
+			message(WARNING "pkg-config will not detect the new package after installation, adjust PKG_CONFIG_PATH using \"export PKG_CONFIG_PATH=\${PKG_CONFIG_PATH}:${CMAKE_INSTALL_PREFIX}/${LIB_INSTALL_DIR}/pkgconfig\".")
 		endif()
 	endif()
 endif()