Reproduce the issue:

$ ./configure --enable-libmfx --enable-vaapi --enable-shared 
--samples=fate-suite/
$ make fate
LD      tests/checkasm/checkasm
/usr/bin/x86_64-linux-gnu-ld: libavutil/libavutil.a(hwcontext_vaapi.o): 
undefined reference to symbol 'XDisplayName'
//usr/lib/x86_64-linux-gnu/libX11.so.6: error adding symbols: DSO missing from 
command line
collect2: error: ld returned 1 exit status
tests/checkasm/Makefile:71: recipe for target 'tests/checkasm/checkasm' failed
make: *** [tests/checkasm/checkasm] Error 1
---
 configure | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure b/configure
index 85d5dd5962..f3e27cea10 100755
--- a/configure
+++ b/configure
@@ -6387,6 +6387,7 @@ if enabled vaapi; then
 
     if enabled xlib; then
         check_pkg_config vaapi_x11 "libva-x11" "va/va_x11.h" vaGetDisplay
+        check_pkg_config vaapi_x11 "libX11" "X11/Xlib.h" XDisplayName
     fi
 
     check_cpp_condition vaapi_1 "va/va.h" "VA_CHECK_VERSION(1, 0, 0)"
-- 
2.17.1

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