I'm trying to compile latest xf86-video-ati git aka
commit c7ed12cb2ea76999351d7cb87877224bdc0664f0 (HEAD -> makepkg, origin/master, origin/HEAD, master)
Date:   Thu Jul 18 18:14:48 2019 +0200

like this:

  export CFLAGS=${CFLAGS/-fno-plt}
  export CXXFLAGS=${CXXFLAGS/-fno-plt}
  export LDFLAGS=${LDFLAGS/,-z,now}

  ./autogen.sh

  ./configure --prefix=/usr \
      --enable-option-checking \
      --enable-debug \
      --disable-glamor              


I encounter this error:

  CC       radeon_kms.lo
  CC       radeon_present.lo
radeon_dri2.c: In function ‘radeon_dri2_exchange_buffers’:
radeon_dri2.c:732:19: warning: unused variable ‘info’ [-Wunused-variable]
  732 |     RADEONInfoPtr info = RADEONPTR(xf86ScreenToScrn(screen));
      |                   ^~~~
  CC       radeon_sync.lo
  CC       radeon_vbo.lo
  CC       drmmode_display.lo
  CC       radeon_bo_helper.lo
  CCLD     ati_drv.la
radeon_present.c: In function ‘radeon_present_check_flip’:
radeon_present.c:283:21: error: dereferencing pointer to incomplete type ‘struct radeon_pixmap’
  283 |     if (priv && priv->fb_failed)
      |                     ^~
make[2]: *** [Makefile:689: radeon_present.lo] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/user/build/1packages/4used/xf86-video-ati-git/makepkg_pacman/xf86-video-ati/src/xf86-video-ati/src'
make[1]: *** [Makefile:461: all-recursive] Error 1
make[1]: Leaving directory '/home/user/build/1packages/4used/xf86-video-ati-git/makepkg_pacman/xf86-video-ati/src/xf86-video-ati'
make: *** [Makefile:393: all] Error 2


Note: it works with --enable-glamor but I hit other non-compilation issues like:
coredump/crash: https://bugs.freedesktop.org/show_bug.cgi?id=74096
and
white screen if xfwm4 vsync is not off: https://bugs.freedesktop.org/show_bug.cgi?id=111687