/usr/include/olgx_private/grey.h is in xviewg-dev 3.2p1.4-28.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #define grey_width 16
#define grey_height 16
static unsigned char grey_bits[] = {
0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55,
0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55,
0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55};
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