Problems with QT and gstreanmer

1. if an error occurs, it may be that when uct pcrf is installed, the related components are incomplete, and two errors are skipped.
1) curl/curl. h: no such file or directory
-- Possible cause is libcurl and related not fully installed, I encountered this error because libcurl4-gnutls-dev is missing
2) src/schemdes. h: 28: 37: Error: GST/interfaces/xoverlay. h: no such file or directory

-- Libgstreamer-related components are missing. This error does not occur during compilation after the libgstreamer-plugins-base0.10-dev is installed.

# Apt-Get install libgstreamer-plugins-base0.10-dev

2. When using gstreamer

Undefined reference to 'gst _ x_overlay_set_xwindow_id'

The cause is:
 

The header file where the stst_x_overlay_set_xwindow_id is located is # include <GST/interfaces/xoverlay. h>
This file contains The dynamic library libgstinterfaces-0.10.so is not explicitly loaded

Solution in code: blocks:
 Settings ==> compiler and debugger ==> linkersettings ==> linker Libraries
  => Add =>/usr/lib/libgstinterfaces-0.10.so

Or:

In .. Add libs + = to the Pro File/Usr/lib/libgstinterfaces-0.10.so