>From a build of master (41eab95b3bc29a4fe6fd08b7f1f80cef5bdc097f) [1]:

  $ lib nm libOSMesa.so | grep "EGL" 
  0000000000064254 t _mesa_EGLImageTargetRenderbufferStorageOES
  00000000000b30c0 t _mesa_EGLImageTargetTexture2DOES
                   U glEGLImageTargetRenderbufferStorageOES
                   U glEGLImageTargetTexture2DOES
  000000000029bb70 T mglEGLImageTargetRenderbufferStorageOES
  000000000029bb90 T mglEGLImageTargetTexture2DOES

this prevents using libOSMesa, since one gets link errors about the
symbol.

Similar output for libMesaGL.

I shouldn't get any EGL when using --disable-egl, right?.  Maybe this
is just the luxury edition...

Side note: libGLU is linked against libOSMesa, so there are issues
using that in a mangled setting as well.  Seems strange that GLU would
need OSMesa symbols, but I'll admit to not keeping up with devel
lately.

-tom

[1]
./configure                           \
    CFLAGS="-g -DUSE_MGL_NAMESPACE"   \
    CXXFLAGS="-g -DUSE_MGL_NAMESPACE" \
    --prefix=${PF}                    \
    --without-demos                   \
    --with-driver=osmesa              \
    --disable-gallium                 \
    --disable-egl                     \
    --with-max-width=16384            \
    --with-max-height=16384           \
    --enable-glx-tls || exit 1

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