Content of RPM libglvnd-devel-1.2.0-6.el8.x86_64.rpm :
/usr/include/EGL
/usr/include/EGL/egl.h
/usr/include/EGL/eglext.h
/usr/include/EGL/eglplatform.h
/usr/include/GL
/usr/include/GL/gl.h
/usr/include/GL/glcorearb.h
/usr/include/GL/glext.h
/usr/include/GL/glx.h
/usr/include/GL/glxext.h
/usr/include/GLES
/usr/include/GLES/egl.h
/usr/include/GLES/gl.h
/usr/include/GLES/glext.h
/usr/include/GLES/glplatform.h
/usr/include/GLES2
/usr/include/GLES2/gl2.h
/usr/include/GLES2/gl2ext.h
/usr/include/GLES2/gl2platform.h
/usr/include/GLES3
/usr/include/GLES3/gl3.h
/usr/include/GLES3/gl31.h
/usr/include/GLES3/gl32.h
/usr/include/GLES3/gl3platform.h
/usr/include/KHR
/usr/include/KHR/khrplatform.h
/usr/lib64/libEGL.so
/usr/lib64/libGL.so
/usr/lib64/libGLESv1_CM.so
/usr/lib64/libGLESv2.so
/usr/lib64/libGLX.so
/usr/lib64/libGLdispatch.so
/usr/lib64/libOpenGL.so
/usr/lib64/pkgconfig/egl.pc
/usr/lib64/pkgconfig/gl.pc
/usr/lib64/pkgconfig/glesv1_cm.pc
/usr/lib64/pkgconfig/glesv2.pc
/usr/lib64/pkgconfig/glx.pc
/usr/lib64/pkgconfig/opengl.pc