Created attachment 373072 [details] [review]
Proposed patch

Gstreamer version: 1.14.1
OS: Linux on embedded system, built with Buildroot (Kernel 3.4)
Hardware: processor Allwinner A20 (ARM), GPU Mali400MP2
Other relevant info: installed sunxi-mali driver, with OpenGLES - EGL+X11

Building gst1-plugins-base, I get this error log (it's in Spanish, sorry):

gsteglimage.c: En la función ‘gst_egl_image_export_dmabuf’:
gsteglimage.c:483:7: error: nombre de tipo ‘EGLuint64KHR’ desconocido
       EGLuint64KHR * modifiers);
       ^~~~~~~~~~~~
gsteglimage.c:493:3: error: ‘gst_eglExportDMABUFImageQueryMESA’ no se declaró aquí (primer uso en esta función)
   gst_eglExportDMABUFImageQueryMESA =
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gsteglimage.c:493:3: nota: cada identificador sin declarar se reporta sólo una vez para cada función en el que aparece
gsteglimage.c:516:8: aviso: declaración implícita de la función ‘gst_eglExportDMABUFImageQueryMESA’ [-Wimplicit-function-declaration]
   if (!gst_eglExportDMABUFImageQueryMESA (egl_display, image->image,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gsteglimage.c:516:3: aviso: declaración externa anidada de ‘gst_eglExportDMABUFImageQueryMESA’ [-Wnested-externs]
   if (!gst_eglExportDMABUFImageQueryMESA (egl_display, image->image,
   ^~ 

I attach a patch that fix the problem for me, with the solution suggested by user ystreet00 in the IRC channel. It builds and I have Gstreamer working fine.